Jack was reading a book in the sitting-room______the phone rang.

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问题 Jack was reading a book in the sitting-room______the phone rang.

选项 A、when
B、since
C、while

答案A

解析 句意:电话响的时候,杰克正在起居室里看电视。本题考查的是时间连词辨析。when与while的意思都是“当…时”,但while只指“时间段”,不指“时间点”,从句的动词只限于持续性动词。而since意为“自从…时候以来”,不合题意。故A正确。
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