He worked ___________ hours to complete the project on time. ...

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He worked ___________ hours to complete the project on time.

A. at

B. in

C. with

D. for

Select your answer:

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The boy persuaded his mother ________ him stay at his friend’s house that night.

A. letting

B. to let

C. to letting

D. let

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I’m sorry, but I don’t _________ the answer.

A. know

B. realize

C. understand

D. ask