题目内容

It was not until the teacher had explained it three times _______ how to work out the problem.

A. did he understandB. had he understood

C. that he understoodD. that he didnt understood

 

【答案】

C

【解析】

试题分析:考查固定句型。句义:直到老师解释了三次我才明白了怎样做这个题,首先给我关键词:It? was +that ,构成强调句型,根据倒装句:not until 位于句首构成:主到从不倒;用语强调句型不倒装,所以C正确。

考点:考查固定句型

 

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