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Hearing loss in a large number of teenagers______ caused because of their listening to loud music.
A.isB.hasC.areD.have
A

试题分析:句意:大多数年轻人听力的损伤是因为他们听了特别大的音乐而引起的。Hearing loss in a large number of teenagers是动名词短语做主语,当动名词短语做主语时谓语动词用单数,这里句子的主语与cause之间是被动关系,故选A。
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