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    14．I had been puzzled over t he problem for over an hour without any result, all at once a solution flashed across my mind. A．while B．when C．then D．as 【查看更多】

     

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    I had been puzzled over t he problem for over an hour without any result,      all at once a solution flashed across my mind.

        A．while                                B．when

        C．then                                 D．as

     

     

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    I had been puzzled over t he problem for over an hour without any result,      all at once a solution flashed across my mind.

        A．while        B．when

        C．then     D．as

    查看答案和解析>>


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