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    The world’s population problem will be serious all the countries do something to control it. A. or B. but C. unless D. and 【查看更多】

     

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    The world's population problem will be serious ________ all the countries do something to control it.


    1. A.
      or
    2. B.
      but
    3. C.
      unless
    4. D.
      and

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    The world's population problem will be serious _____ all the countries do something to control it.
    [     ]
    A. or
    B. but
    C. unless
    D. and

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    The world's population problem will be serious            all the countries do something to control it.
    [     ]
    A. or
    B. but
    C. unless
    D. and

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