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【题目】I was doing homework ________ the phone bell rang.

A. when B. while C. as D. if

【答案】A

【解析】

句意:当我正做作业时,电话铃声响了。when可指时间点和时间段;while只能指时间段,从句中用延续性动词;as多用于表示两个动作同时发生,或者一种状态随另一种状态的变化而变化;if如果,引导条件状语从句。这里考查句型be doing sth. when…“正在做某事,这时…”,故选A。

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