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【题目】We need to get to the root(本质) of the problemwe can solve it.
A.while
B.after
C.before
D.as

【答案】C
【解析】句意:我们需要解决问题之前,弄清问题的本质。while当……时候,表示同时发生; after在……之后; before在……之前;as伴随,表示同时发生。结合句意,在解决问题之前,了解清楚问题的本质。故选C。

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