Her uncle′s health has greatly improved_

题库总管2019-12-17  7

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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