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21、If he had known it was going to rain,he       his umbrella to work.

    A.should have taken     B.would have taken

    C.must have taken       D.could have taken

21、B

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If he had known it was going to rain,he       his umbrella to work.

    A.should have taken     B.would have taken

    C.must have taken       D.could have taken

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