2. 职称考试
  3. Listening to loud music at rock concerts __________caused hearing loss in som...

Listening to loud music at rock concerts __________caused hearing loss in som...

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问题 Listening to loud music at rock concerts __________caused hearing loss in some teenagers．
选项 A.is
B.are
C.has
D.have
答案C
解析考查主谓一致。动名词作主语，句子的谓语动词用单数形式，由此排除B、D两项，根据主句与caused的主动关系，排除A项。故选C。
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