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 didn’t understood
C

試題分析：考查固定句型。句義：直到老師解釋了三次我才明白了怎樣做這個題，首先給我關(guān)鍵詞：It  was …+that …,構(gòu)成強調(diào)句型，根據(jù)倒裝句：not until 位于句首構(gòu)成：主到從不倒；用語強調(diào)句型不倒裝，所以C正確。
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