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【题目】Thinking that you know ________ in fact you don't know is a serious mistake.

A.whatB.thatC.whenD.however

【答案】A

【解析】

考查宾语从句。句意:自以为你知道事实上你不知道的事情,是一个严重的错误。分析句子可知,本句为带有两个宾语从句的复合句,其中,that…you don’t know为第一个宾语从句,这个从句中又带了一个宾语从句,know后的内容做know的宾语。分析第二个宾语从句,可知,句中缺少宾语,选项A. what什么,符合题意。故选A项。

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