【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】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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