【題目】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】

試題分析：句意：在我們解決問題之前，我們需要找到問題的根源。A. while當(dāng)……時(shí)候，而；B. after在……之后； C. before 在……之前；D. as正如。根據(jù)句意可知選C。

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