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    We to be careful of rats since the whole street was full of rubbish. A. were warning B. warned C. have been warned D. have warned 【查看更多】

     

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    We ________ to be careful of rats since the whole street was full of rubbish．


    1. A.
      warned
    2. B.
      have warned
    3. C.
      have been warned
    4. D.
      were warned

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