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问题

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
正确答案是:
同类题型

will the meeting end一In half an hour.

The problems are difficult to solve. Please give me_________.

The driver started to speed up to ______ for the hour he had lost in the traffic jam.

Tom told me that he needed a chair and that soon hefound .

I could________by the way she walked that her knee was still bothering her.[ ]

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