根据n多题专家分析，试题“Not until his mother came back_______.A．he began to do his homeworkB．had he began to do his homeworkC．he had begun to do his homeworkD．did he begin to do his ho…”主要考查了你对 【全部倒装】，【部分倒装】，【省略句】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
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