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    He ________ explain, this is the second time he was late for work, doesn’t he?


    1. A.
      needs to
    2. B.
      need to
    3. C.
      need
    4. D.
      needs

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    You ____ explain, everything is proved.

    A. mustn’t                B. needn’t                C. don’t need            D. shouldn’t

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     You ____ explain, everything is proved .

        A. mustn’t     B. needn’t      C. don’t need     D. shouldn’t

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    Please explain ________ you bought these postcards.

    [　　]

    A．who

    B．what

    C．why

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    He ________ explain, this is the second time he was late for work, doesn’t he?

    [　　]

    A．needs to

    B．need to

    C．need

    D．needs

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