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    Alice received an invitation from her boss,__________came as a surprise.

    A.it                              B.that                           C.which                       D.he

    C


    解析:

    此句为非限制性从句，不能用 that修饰，而用which。it 和he 都使后句成为句子，两个独立的句子不能单以逗号连接。况且选he句意不通。

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