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

試題分析：考查倒裝句：not until放在句首的時候，主句用部分倒裝，答案在BD里面選擇，句意：直到他媽媽回來，他才開始做作業(yè)�？芍菋寢尰貋砗螅鲎鳂I(yè)，不是過去的過去的動作。選D。
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