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【题目】-Betty was doing her homework______the door bell rang.

A.when B.if C.because D.and

【答案】A

【解析】

试题分析:句意:--当门铃响的时候,Betty正在做他的作业。A.when当……的时候了;B.if 如果;C.because因为;D.and和,又。根据题意,故选A。

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