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    35．I had not been reading for half an hour I heard the steps outside． A．when B．while C．as D．since 【查看更多】

     

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    I had not been reading for half an hour _____ I heard the steps outside.

    A．when

    B．while

    C．as

    D．since

     

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    I had not been reading for half an hour _____ I heard the steps outside.

    A．whenB．whileC．asD．since

    查看答案和解析>>


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