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

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

【答案】C

【解析】

试题分析:句意:众所周知,疑问是知识的钥匙。A、questions 问题;B、problems难题;C、doubt 疑问; D、mistakes错误。根据句意及题干分析此题应选C。

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