题目内容
He took medicine 3 times a day,________ didn't work.
| A．it | B．but | C．which | D．but which |
C
解析试题分析：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。
考点：考查非限制性定语从句
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