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    While building a tunnel though the mountains, . A. an underground lake was discovered B. there was an underground lake discovered C. a lake was discovered underground D. the workers discovered an underground lake 【查看更多】

     

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    While building a tunnel though the mountains,________.

    A.an underground lake was discovered

    B.there was an underground lake discovered

    C.a lake was discovered underground

    D.the workers discovered an underground lake

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