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22 Dec 2021, 02:30
Kudos
Bookmarks
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
32% (01:35) correct
68%
(01:17)
wrong
based on 320
sessions
History
Date
Time
Result
Not Attempted Yet
Black holes, collapsed stars whose massive gravitational pull traps even light, are invisible to telescopes but have been detected by sighting the swirling eddies of gas being swallowed by the black holes.
A. are invisible to telescopes but have been detected by sighting
B. is invisible to telescopes but detectable by sighting
C. are invisible to telescopes but detectable by the sight of
D. are invisible to telescopes but were detected by the sight of
E. is invisible to telescopes even though they can be detected by the sight of
A. are invisible to telescopes but have been detected by sighting
B. is invisible to telescopes but detectable by sighting
C. are invisible to telescopes but detectable by the sight of
D. are invisible to telescopes but were detected by the sight of
E. is invisible to telescopes even though they can be detected by the sight of
23 Dec 2021, 02:15
Kudos
Bookmarks
Bunuel
OFFICIAL EXPLANATION
Answer: A.
Black holes, according to the sentence, have two characteristics: they are invisible but have been detected. These two forms are parallel. Choice B not only incorrectly uses “is” when “are” is required, but also violates parallelism because “detectable by sighting” lacks the verb form of the first clause. Choice E also contains the same subject-verb agreement error as B. Choice C also contains an error in parallel construction. Choice D unnecessarily changes the second verb to the past tense.
General Discussion
22 Dec 2021, 03:11
Kudos
Bookmarks
My answer is (C). It took me 49 seconds.
(A) "Sight", as a verb, means "catch sight of; see". Black holes can be detected by seeing the eddies? Black holes cannot see and surely does not need to see to know its own existence.
(B) SVA error.
(C) "Sight", as a noun, means "a thing that one sees or that can be seen.".
Good enough. Keep for now.
(D) Very similar to (C), but the shift in verb tense got readers to wonder if black holes can still be detected by the sight.
(E) SVA error.
(A) "Sight", as a verb, means "catch sight of; see". Black holes can be detected by seeing the eddies? Black holes cannot see and surely does not need to see to know its own existence.
(B) SVA error.
(C) "Sight", as a noun, means "a thing that one sees or that can be seen.".
Good enough. Keep for now.
(D) Very similar to (C), but the shift in verb tense got readers to wonder if black holes can still be detected by the sight.
(E) SVA error.
