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    People begin to know that most environmental problems exist because necessary measures for preventing them taken in the past. A. are not B. were not C. hadn't been D. wouldn't be 【查看更多】

     

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    People begin to know that most environmental problems exist because necessary  measures for preventing them _______taken in the past.

    A. are not    B. were not   C. hadn't been    D. wouldn't be

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    People begin to know that most environmental problems exist because necessary measures for preventing
    them _____ taken in the past.
    [     ]
    A. are not
    B. were not
    C. hadn't been
    D. wouldn't be

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    4. People begin to know that most environmental problems exist because necessary  measures for preventing them _______taken in the past.

    A. are not    B. were not   C. hadn't been    D. wouldn't be

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    4. People begin to know that most environmental problems exist because necessary  measures for preventing them _______taken in the past.

    A．are notB．were notC．hadn't beenD．wouldn't be

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     (2011年南京模拟)People begin to know that most environmental problems exist because necessary measures for preventing them________taken in the past.

    A．are not                         B．were not

    C．hadn’t been                  D．wouldn’t be

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