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krisjoan
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Since its inception in 1958, NASA led most US space exploration 28 Sep 2017, 16:49
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Since its inception in 1958, NASA led most US space exploration efforts, and currently supports the International Space Station and oversaw the development of the Orion Multi-Purpose Crew Vehicle.

(A) led most US space exploration efforts, and currently supports the International Space Station and oversaw

(B) has led most US space exploration efforts, and currently supported the International Space Station and oversaw

(C) led most US space exploration efforts, and currently supports the International Space Station and oversees

(D) has led most US space exploration efforts, and is currently supporting the International Space Station and overseeing

(E) had led most US space exploration efforts, and is currently supporting the International Space Station and overseeing
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D
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ng2
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Since its inception in 1958, NASA led most US space exploration 28 Sep 2017, 17:20
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please mention the source of this question.
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krisjoan
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Since its inception in 1958, NASA led most US space exploration 28 Sep 2017, 17:50
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The source is one of the local coaching institutions that i have joined for my prep of gmat.
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ng2
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Since its inception in 1958, NASA led most US space exploration 28 Sep 2017, 17:53
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Concepts tested: Tenses
A - present perfect tense ‘has led’ must be used.
B –Since NASA is currently on these projects, past tense cannot be used
C – Same as A
D – This option uses the right tense
E – Same as A.
Hope it helps.
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Since its inception in 1958, NASA led most US space exploration 28 Sep 2017, 17:55
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ng2
Concepts tested: Tenses
A - present perfect tense ‘has led’ must be used.
B –Since NASA is currently on these projects, past tense cannot be used
C – Same as A
D – This option uses the right tense
E – Same as A.
Hope it helps.
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Can you please elaborate why in option A present perfect tense has been used ?
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ng2
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Since its inception in 1958, NASA led most US space exploration 28 Sep 2017, 17:57
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krisjoan
ng2
Concepts tested: Tenses
A - present perfect tense ‘has led’ must be used.
B –Since NASA is currently on these projects, past tense cannot be used
C – Same as A
D – This option uses the right tense
E – Same as A.
Hope it helps.

Can you please elaborate why in option A present perfect tense has been used ?
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since nasa began leading and continues to do so in the present hence the usage of present perfect tense.
Hope it helps.
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Since its inception in 1958, NASA led most US space exploration 01 Oct 2017, 06:35
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krisjoan
ng2
Concepts tested: Tenses
A - present perfect tense ‘has led’ must be used.
B –Since NASA is currently on these projects, past tense cannot be used
C – Same as A
D – This option uses the right tense
E – Same as A.
Hope it helps.

Can you please elaborate why in option A present perfect tense has been used ?
Show more

Hi krisjoan,

The presence of the word "Since" at the beginning of the sentence indicates that the action started in the past and is still continuing in the present which mandates the usage of the present perfect.

I hope it is more clear now


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Since its inception in 1958, NASA led most US space exploration 30 Nov 2023, 11:46
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