Peter'smotherkepttellinghimthat

发布时间：2020-07-28 13:42:10

Peter's mother kept telling him that he should give up smoking, but ________ didn't help．A.heB.whichC.sheD.it

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D解析本题中因有并列连词but，故不能用关系代词which。此处if指上面那件事。
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