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Scientists have trained

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by kvcpk » Sat Jun 12, 2010 6:03 am
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

OA is E

What is the rule We need to apply in this case?
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by thephoenix » Sat Jun 12, 2010 6:38 am
rule: parrallelism
x and y
E is correct
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by kvcpk » Sat Jun 12, 2010 6:45 am
thephoenix wrote:rule: parrallelism
x and y
E is correct
Does "X and Y" mean that "Have" should be present in Y if it is present in X?
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by blaster » Sat Jun 12, 2010 10:35 am
it means, they must be paralel
kvcpk wrote:Scientists have trained their telescopes on Arp 229, a pair of merging galaxies, and saw stars exploding in numbers far greater than expected.

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by loveusonu » Sat Jun 12, 2010 12:52 pm
kvcpk wrote: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

OA is E

What is the rule We need to apply in this case?
"have trained" and "have seen" are parallel.

You can't say "have saw" as saw is in past and 'have' is present perfect form. that rules out A, B, C.

Between D and E, have is not a issue, even is 'have' is not present it can be assumed. The problem in D is 'being', which is also 90% of the time Incorrect in GMAT.

Hence E.
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by outreach » Sat Jun 12, 2010 1:08 pm
We have "Have trained" so, for paralellism we need "seen".
D is out because being is there
E is correct
kvcpk wrote: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

OA is E

What is the rule We need to apply in this case?
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