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

试题分析:句意:他一天吃三次药,这不奏效。这里需要非限制性定语从句,用which引导,指代前面的句子,在定语从句中which做主语,如果用but连接并列句,应该是but it…,所以选C。
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