They received demands that the work _______

They received demands that the work ________ at once.

#86906

must be done

would be done

had been done

be done

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—Guess what？ I have got A for my term paper.—Great!You _______ read widely and put a lot of work into it.

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As is natural, a man as old as he ______ be very forgetful.

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couldn’t have received

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—Will you read me a story, Mummy? —OK．You    have one if you go to bed right away．

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