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题目
题型:不详难度:来源:
When he knocked at the door, my mother was busy ____ supper.
A.preparing forB.in preparing
C.to prepare forD.to prepare

答案
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。
核心考点
试题【When he knocked at the door, my mother was busy ____ supper.A.preparing forB.in 】;主要考察你对句式等知识点的理解。[详细]
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