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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

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。
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