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【题目】I was doing my homework the door bell rang.

A. while B. when

C. after D. before

【答案】B

【解析】

试题分析:句意:当门铃响的时候,我正在做我的作业。这里是when引导的时间状语从句,当某个动作发生的时候,某个动作正在进行。A. While当……的时候;B. When何时;C. After在……之后;D. Before在……之前。根据题意,故选B。

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