When he knocked at the door, my mother was busy ____ supper.A.preparing forB.in preparingC.to prepar

题目简介

When he knocked at the door, my mother was busy ____ supper.A.preparing forB.in preparingC.to prepar

题目详情

When he knocked at the door, my mother was busy ____ supper.
A.preparing forB.in preparing
C.to prepare forD.to prepare
题型:单选题难度:偏易来源:不详

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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