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    【题目】I_______ my homework when the door bell__________.

    A. did, rang B. was doing, was ringing

    C. did, was ring D. was doing, rang

    【答案】D

    【解析】

    试题分析：根据题干，本句的意思是“当门铃响的时候，我正在做作业。”当句中用when时，从句应用过去时，主句用过去进行时。所以本题选D。

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