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Listening to loud music at rock concerts__________caused hearing loss in some teenagers.
A.isB.areC.hasD.have
C
本题考查主谓一致。本题考查动名词短语作主语,故谓语动词用单数,根据句意用现在完成时,选C。句意:在摇滚音乐会听大声的音乐已经使得一些青少年的听力受损。
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