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

試題分析:句意:他一天吃三次藥,這不奏效。這里需要非限制性定語從句,用which引導(dǎo),指代前面的句子,在定語從句中which做主語,如果用but連接并列句,應(yīng)該是but it…,所以選C。
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