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【题目】We need to get to the root of the problem ________ we can solve it.
A.while
B.after
C.before
D.as

【答案】C
【解析】句意:在我们解决问题之前,我们需要找到问题的根源。A. while“当……时候,而”;B. after“在……之后”; C. before “在……之前”;D. as“正如”。根据句意可知选C。

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