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

     

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    While building a tunnel through the mountain, _____.

    A. the workers discovers discovered

    B. an underground lake was discovered

    C. there was an underground lake discovered

    D. the lake was discovered underground

    查看答案和解析>>

    While building a tunnel through the mountain, _____.

    A. the workers discovers discovered

    B. an underground lake was discovered

    C. there was an underground lake discovered

    D.the lake was discovered underground

     

    查看答案和解析>>


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