题目内容

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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