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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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