题目内容
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
B
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题目内容
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
B