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    27、--- I haven’t heard from my sister since last month.

    --- Don’t worry, Janet. Letters from abroad _____ be slow sometimes.

    A. need to                 B. can                   C. should              D. ought to

    27、C

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    --- I haven’t heard from my sister since last month.

    --- Don’t worry, Janet. Letters from abroad _____ be slow sometimes.

    A. need to                 B. can                   C. should              D. ought to

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