摘要： 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.
| A．being used | B．used | C．to be used | D．having been used |
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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