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    20、I was about to go to bed ____ suddenly someone knocked at the door.

    A. while         B. since            C. when           D. then

    20、C

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    A. while         B. since            C. when           D. then

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    科目：高中英语 来源：合肥市第七中学2009届高三第五次月考英语试卷(最新题型) 题型：014

    I was about to go to bed ________ suddenly someone knocked at the door．

    [　　]

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