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    Electronic devices such as iPods and headphones can do great harm to our hearing if improperly. A. being used B. used C. to be used D. having been used 【查看更多】

     

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    Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.

    A．being usedB．usedC．to be usedD．having been used

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    Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.

    A．being used        B．used             C．to be used         D．having been used

     

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    Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.


    1. A.
      being used
    2. B.
      used
    3. C.
      to be used
    4. D.
      having been used

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     Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.

    A. being used                 B. used      C. to be used    D. having been used

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