krisjoan wrote:
ng2 wrote:
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.
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?
Hikrisjoan ,
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
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