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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】

试题分析:句意:在我们解决问题之前,我们需要找到问题的根源。A. while……时候,而;B. after……之后; C. before ……之前;D. as正如。根据句意可知选C

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