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    精英家教网 > 高中英语 > 题目详情

    When he knocked at the door, my mother was busy ____ supper.

    A. preparing for                                  B. in preparing

    C. to prepare for                                 D. to prepare

    B


    解析:

    “be busy (in)doing something” 忙于干谋士，要求接动词的-ing形式。准备的直接宾语是“supper”,故其前面不用介词for。

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