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    3．A． having B． shown C． wearing D．showing 【查看更多】

     

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              in the river for five hours, the thief looked very pale and exhausted.

    A．Having been trapped 　

    B．Being trapped 　

    C．Trapping

    D．Having trapped

     

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    ________ him before, I didn't recognize him.

    A．Having never seen　　

    B．Never seeing

    C．Not seeing　

    D．Having not seen

     

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    ______ in the chimey for five hours, the thief looked very pale and tired.

    A．Having been trapped 　

    B．Being trapped 　

    C．trapping　　

    D．Having trapped

     

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    Though ______, many laws of nature exist.

    　 A. not having been discovered 　 B. having not been discovered

    　 C. not having discovered 　    D. having not discovered

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    Though ______, many laws of nature exist.

    　 A. not having been discovered 　 B. having not been discovered

    　 C. not having discovered 　     D. having not discovered

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