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When he knocked at the door, my mother was busy supper. A. preparing for B. in p

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When he knocked at the door, my mother was busy supper. A. preparing for B. in p

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

A. preparing for B. in preparing

C. to prepare for D. to prepare

 

试题答案

B

“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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