34. When he knocked at the door, my mother was busy supper.A. preparing forB. in preparin

发布时间：2020-08-15 01:29:45


34. When he knocked at the door, my mother was busy      supper.
A. preparing for
B. in preparing
C. to prepare for
D. to prepare

网友回答

A. preparing for
(答案→)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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