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

A.whatB.thatC.whenD.however

【答案】A

【解析】

考查賓語從句。句意:自以為你知道事實上你不知道的事情,是一個嚴重的錯誤。分析句子可知,本句為帶有兩個賓語從句的復合句,其中,that…you don’t know為第一個賓語從句,這個從句中又帶了一個賓語從句,know后的內容做know的賓語。分析第二個賓語從句,可知,句中缺少賓語,選項A. what什么,符合題意。故選A項。

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