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Excavations to allow

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Excavations to allow

by darlingriyarai » Sun Nov 25, 2012 8:28 pm
Excavations to allow the world's largest ships to pass through the canal have exposed geologic formations millions of years old, and provides researchers an opportunity to investigate ancient climate patterns.

A. old, and provides
B. old and given
C. old, providing for
D. old and has provided
E. old and gives
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by Bill@VeritasPrep » Sun Nov 25, 2012 11:53 pm
The word "and" is being used to link two actions. The first is "have exposed", so the second, which is underlined, must parallel that form.

A and E use present tense verbs, which does not match the present perfect of the first action.

C does not give us a conjugated verb.

B and D both use present perfect, but D has an agreement error. What has provided the opportunity? The excavations, so it should be "have provided."

B works: have (exposed) and (given)
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