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    This exercise requires carefully. We should do as we are required . A. to do ; doing B. to be done ; doing C. to be done ; to doing D. doing ; to do 【查看更多】

     

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    This exercise requires ________ carefully. We should do as we are required ________.


    1. A.
      to do; doing
    2. B.
      to be done; doing
    3. C.
      to be done; to doing
    4. D.
      doing; to do

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    This exercise requires ________ carefully. We should do as we are required ________.

    [　　]

    A．to do; doing
    B．to be done; doing
    C．to be done; to doing
    D．doing; to do

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