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，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，應該是but it…，所以選C。
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