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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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