When he knocked at the door, my mother was busy supper. A. preparing for B. in preparing C. to prepare for D. to prepare 题目和参考答案——青夏教育精英家教网—

题目内容

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

A. preparing for B. in preparing

C. to prepare for D. to prepare

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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