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Not until his mother came back_______.
A.he began to do his homeworkB.had he began to do his homework
C.he had begun to do his homeworkD.did he begin to do his homework
D

试题分析:考查倒装句:not until放在句首的时候,主句用部分倒装,答案在BD里面选择,句意:直到他妈妈回来,他才开始做作业。可知是妈妈回来后,他做作业,不是过去的过去的动作。选D。
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