题目内容

Someone knocked at the door he was doing his homework.

A.afterB. when C. untilD. as soon as

 

B

【解析】

试题分析:句意:有人敲门,他正在做作业。After在……之后;when当……的时候; until直到; as soon as一……就。结合前后句子意思可知该选B。

考点:考查连词。

 

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