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mattce
Unlike the Gregorian calendar, the synchronization of the calendar year with the astronomical year in the Chinese calendar is not achieved by intercalating a day once every four years, but by adding an intercalary month about once every three years.

easy one.
compares georgian calendar with the synchronization. so incorrect.

(A) -
(B) The Gregorian calendar, unlike the Chinese calendar, achieves the synchronization of the calendar year with the astronomical year by intercalating
looks tempting, but changes the meaning. Instead of Chinese calendar, which does smth, it is the Georgian calendar. Moreover, the idiom not by X, but by Y is not complete.

(C) Unlike the Gregorian calendar, the astronomical year is synchronized with the calender year in the Chinese calender, not by intercalating
compares calendar with astronomical year. out.

(D) Unlike synchronizing the calendar year with the astronomical year in the Gregorian calendar, the Chinese calendar does not achieve this with the intercalation of
compares synchronizing with calendar. out.

(E) Unlike the synchronization of the calendar year with the astronomical year in the Gregorian calendar, this synchronization in the Chinese calender is not achieved by intercalating
compares synchronizations. idiom though is not correct. not by X but by Y. X and Y are not parallel. nevertheless, the other ones have major errors, based on which the answer choices could be easily dismissed.
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This one was literally 10 second question. Just check Unlike X, Y and the only correct answer is E.

mattce
Unlike the Gregorian calendar, the synchronization of the calendar year with the astronomical year in the Chinese calendar is not achieved by intercalating a day once every four years, but by adding an intercalary month about once every three years.

(A) -
(B) The Gregorian calendar, unlike the Chinese calendar, achieves the synchronization of the calendar year with the astronomical year by intercalating
(C) Unlike the Gregorian calendar, the astronomical year is synchronized with the calender year in the Chinese calender, not by intercalating
(D) Unlike synchronizing the calendar year with the astronomical year in the Gregorian calendar, the Chinese calendar does not achieve this with the intercalation of
(E) Unlike the synchronization of the calendar year with the astronomical year in the Gregorian calendar, this synchronization in the Chinese calender is not achieved by intercalating
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mattce
Unlike the Gregorian calendar, the synchronization of the calendar year with the astronomical year in the Chinese calendar is not achieved by intercalating a day once every four years, but by adding an intercalary month about once every three years.

(A) -
(B) The Gregorian calendar, unlike the Chinese calendar, achieves the synchronization of the calendar year with the astronomical year by intercalating
(C) Unlike the Gregorian calendar, the astronomical year is synchronized with the calender year in the Chinese calender, not by intercalating
(D) Unlike synchronizing the calendar year with the astronomical year in the Gregorian calendar, the Chinese calendar does not achieve this with the intercalation of
(E) Unlike the synchronization of the calendar year with the astronomical year in the Gregorian calendar, this synchronization in the Chinese calender is not achieved by intercalating

IMO, B comes close with correct comparison but then the meaning is COMPLETELY lost. none of the other options come close for all of them are riddled with wrong comparisons.
WRT the OA mention, it cannot be for Unlike can be used with nouns and not clauses. Also, what's this "...this synchronization in the Chinese calendar..."? What does "this" refer to?

sayantanc2k - Your thoughts on this question?
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Hi, I have a question for the correct ans choice E. Don't you think the placement of 'not' is incorrect in option E? I think it is breaking the rules of parallelism -

(E) Unlike the synchronization of the calendar year with the astronomical year in the Gregorian calendar, this synchronization in the Chinese calender is not achieved by intercalating

IMO the correct placement should be -

(E) Unlike the synchronization of the calendar year with the astronomical year in the Gregorian calendar, this synchronization in the Chinese calender is achieved not by intercalating
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Option B. Gregorian calendar needs to compare with Chinese calendar. Only b does that. In rest of the options, comparison is between wrong entities.

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