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    The group of students went to the suburb, did some research work, and the water in the river to see if it had been polluted. A. proved B. boiled C. tested D. exchanged 【查看更多】

     

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    The group of students went to the suburb, did some research work, and ________ the water in the river to see if it had been polluted.

    A. proved          B. boiled           C. tested          D. exchanged

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     The group of students went to the suburb, did some research work, and ________ the water in the river to see if it had been polluted.

    A. proved            B. boiled             C. tested            D. exchanged

     

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    The group of students went to the suburb, did some research work, and ________ the water
    in the river    to see if it had been polluted.
    [      ]
    A. proved          
    B. boiled          
    C. tested          
    D. exchanged

    查看答案和解析>>


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