Electronic devices such as iPods and headphones can do great harm to our hearing

题干

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

上一题下一题 0.64难度单项选择更新时间:2013-06-09 10:50:27

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