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20.-Your colleague says she cannot help because she has got much work to do.

    -Well, she ______ say that because she always uses that excuse.

    A.should         B.may          C.can            D.would

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19.A recent study showed how the temperature,______ water freezes, can be changed using electric charges.

    A.at which         B.for which        C.in which        D.with which

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