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    She was writing a letter someone knocked at the door. A.but B.because C.when D.and 答案:C 【查看更多】

     

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    She was writing a letter ______someone knocked at the door.

    A. but　　　　　　　　   B.because　　　　　　  C.when　　　　　　　　 D.and

     

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    She was writing a letter       someone knocked at the door．

    A．but          B．because         C．when               D．and

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