题目内容

Listening to loud music at rock concerts ____ caused hearing loss in some teenagers.
A．isB．areC．hasD．have
C
在摇滚音乐会听大声音乐在一些青少年中已经引起了听力的损伤。动名词作主语谓语动词用单数，已经引起，应为完成时。
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