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20.He took medicine 3times a day,________ didn't work.(  )
A.itB.butC.whichD.but which

分析 这种药一天三次,没有什么效果.

解答 答案:C
分析句子结构,逗号前为主句,空白处为非限制性定语从句,缺少主语,用which,代指"他一天吃三次药"这件事情.

点评 本题考查非限制性定语从句,考生需先分析句子结构,判断缺少成分,注意which可以代指整个一件事情.

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