【題目】As we all know is the key to knowledge.

A. questions B. problems C. doubt D. mistakes

【答案】C

【解析】

試題分析：句意：眾所周知，疑問(wèn)是知識(shí)的鑰匙。A. questions 問(wèn)題；B. problems難題；C. doubt 疑問(wèn)；D. mistakes錯(cuò)誤。根據(jù)句意及題干分析此題應(yīng)選C。

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