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    Mother opened the envelope, then the letter and began to read it to us. A. folding B. unfolding C. folded D. unfolded 【查看更多】

     

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    Mother opened the envelope, then ________ the letter and began to read it to us．

    [　　]
    A．

    folding

    B．

    unfolding

    C．

    folded

    D．

    unfolded

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