单项选择题

Listening to loud music at rock concerts caused hearing loss in some teenagers.（）

A. is
B. are
C. has
D. have

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He regretted（）too much time on computer game.

A. to cost
B. costing
C. to spend
D. spending
单项选择题
It was the doctor's carelessness that（）the serious accident.

A. resulted from
B. resulted in
C. brought up
D. brought in
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