问题补充：
单选题Forsometimetheexpert__________peopleofthehealthriskscausedbypassivesmoking.Hesayshewon stopuntilallthesmokersaroundhimdecidetoquitsmoking.A.is warnedB.is warningC.has been warningD.has been warned
答案：
C解析 略
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时间：2020-09-29 13:46:55
单选题Forsometimetheexpert__________peopleofthehealthriskscausedbypassivesmoking.Hesayshewon stopuntilallthesmokersaroundhimdecidetoquitsmoking.A.is warnedB.is warningC.has been warningD.has been warned
C解析 略
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