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    While reading a book , . A. the girl came in B. my mother was cooking C. I heard a knock on the door D. the doorbell rang 【查看更多】

     

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    Choose the best answer which can complete the sentence.

    While reading a book, ________.

    [　　]

    A．the girl came in

    B．my mother was cooking

    C．I heard a knock on the door

    D．the doorbell rang

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