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    My mother ______ when someone knocked at the door.

    A. cooked
    B. is cooking
    C. will cook
    D. was cooking
    D
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    科目：初中英语 来源：期末题 题型：单选题

    My mother ______ when someone knocked at the door.

    [     ]

    A. cooked
    B. is cooking
    C. will cook
    D. was cooking

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