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vksunder
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vksunder
Scientists have trained their telescopes on Arp 229, a pair of merging galaxies, and saw stars exploding in numbers far greater than expected.


a. and saw stars exploding in numbers far greater than expected

b. and saw stars exploding in numbers far greater than they were expecting

c. and saw stars exploding in far greater numbers than expected

d. and seen stars exploding in far greater numbers than being expected

e. and have seen stars exploding in far greater numbers than expected

IMO E)

The tense cannot be in past so A, B and C are gone. Between D) and E) , E) is better since "seen" alone doesnt make sense
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We have "Have trained" so, for paralellism we need "seen". We don't have an idiom or an absolute phrase, so "being" is wrong. Remains E.
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Scientists had trained their telescopes on Arp 229, a pair of merging galaxies, and saw stars exploding in numbers far greater than expected.

Had the sentence been this, (had replacing have), what would have been the answer??
Perfect tense- 2 events-
1. trained their telescopes
2. saw the stars exploding

so had for the first event (had trained) and simple past for the second one (saw stars...)

Correct?? :peek
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E.+1. Scientists have trained..................and have seeen.....
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+1 E

Not my favorite, but the best among the others.
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present perfect tense must be used for past actions when the exact time of the actions is not available. in the sentence here the first action(training telescope) has the correct tense but not the second action (seeing stars).
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RohitKalla
Scientists had trained their telescopes on Arp 229, a pair of merging galaxies, and saw stars exploding in numbers far greater than expected.

Had the sentence been this, (had replacing have), what would have been the answer??
Perfect tense- 2 events-
1. trained their telescopes
2. saw the stars exploding

so had for the first event (had trained) and simple past for the second one (saw stars...)

Correct?? :peek

In this case I would go with had seen the stars exploding.
Could anyone verify this? Thanks in advance!



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