【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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