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题目
题型:不详难度:来源:
What were you doing ________ the thief came in?
A. when            B. while      C. after
答案
A
解析

试题分析:句意:当贼进来的时候,你在干什么?when 说明从句的动作和主句的动作可以是同时,也可以是先后发生;while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。结合句意,故选A。
核心考点
试题【What were you doing ________ the thief came in?A. when            B. while      】;主要考察你对助动词等知识点的理解。[详细]
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