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    He was about to tell me the secret ________ someone patted him on the shoulder.

     A. as         B. until

    C. while      D. when

    .D


    解析:

    此题考查be about to do something when…这个句型的用法，when的意思是：这时（at the time）. 这句话的意思是：他正要告诉我这个秘密，这时有人拍他的肩膀。

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