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    19、-How long has he been kept here?

    -It______ two weeks______ he was caught．

    A．has been; before                                         B．was; until

    C．is; since                                                     D．has been; when

    19、C

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    -How long has he been kept here?

    -It______ two weeks______ he was caught．

    A．has been; before                                         B．was; until

    C．is; since                                                     D．has been; when

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