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【题目】Joan was walking in the street________ she saw the accident.

A.whenB.whileC.afterD.before

【答案】A

【解析】

句意:琼在街上走的时候看到了事故。

考查连词辨析。when当……的时候,表示某一个动作正在进行时另一个动作突然发生,从句动词用终止性动词或延续性动词;while当……的时候,从句中的动词必须是延续性动词;after在……之后;before在……之前。根据“she saw the accident.她看到了事故”,see是非延续性动词,可知后面三项不合句意语境,故选A

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