Her uncle’s health has greatly improved______he stopped smoking.

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问题 Her uncle’s health has greatly improved______he stopped smoking.

选项 A、before
B、since
C、when
D、while

答案B

解析考查连词辨析。before“在……之前”，since“自从”，when“当……时”，while“当……的时候；虽然；然而”。根据句意“自从戒烟以来，她叔叔的健康已经有了很大的改善”可知，只有since符合题意。故选B。

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中学英语

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