Listening to loud music at rock concerts caused hearing loss in some teenagers.A. isB. are

问题补充：

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

A. is

B. are

C. has

D. have

答案：

A. is

B. are

(答案→)C. has

D. have

解析：非谓语动词作主语谓动词为单数故为A或者C,声音太大导致了失鸣是主动关系。故排Ａ

句意为：在摇滚音乐会上听很大声音的音乐导致了一些青少年的失鸣。