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

分析 這種藥一天三次，沒有什么效果．

解答 答案：C
分析句子結構，逗號前為主句，空白處為非限制性定語從句，缺少主語，用which，代指"他一天吃三次藥"這件事情．

點評 本題考查非限制性定語從句，考生需先分析句子結構，判斷缺少成分，注意which可以代指整個一件事情．

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