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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 【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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