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    题目列表(包括答案和解析)

    Light bulb which was invented by Edison ________ now．


    1. A.
      was widely used
    2. B.
      is widely used
    3. C.
      will be widely used
    4. D.
      used widely

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    Light bulb which was invented by Edison _________now.       
    [     ]
    A. was widely used          
    B. is widely used
    C. will be widely used        
    D. used widely

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    Light bulb which was invented by Edison ________ now．

    [　　]

    A．was widely used

    B．is widely used

    C．will be widely used

    D．used widely

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    The light bulb ______ by Edison in the middle of the 1780s.

    A．is inventedB．was inventedC．inventedD．invent

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    The light bulb ______ by Edison in the middle of the 1780s.

    A．is invented        B．was invented       C．invented          D．invent

     

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