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    21、___in the school regulation that teachers shouldn’t use cell-phones in class is often ignored.

    A.    What requires     B. What’s required      C. It requires     D. It is required

     

     

    21、B

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    ___in the school regulation that teachers shouldn’t use cell-phones in class is often ignored.

    A.    What requires     B. What’s required      C. It requires     D. It is required

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