◎ 题干
When doing my homework,________.
A.I heard the doorbell ringB.the doorbell rang
C.my mother came inD.my mother was cooking
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“When doing my homework,________.A.I heard the doorbell ringB.the doorbell rangC.my mother came inD.my mother was cooking…”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。