Listening to loud music at rock concerts__________caused hearing toss in some...

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问题 Listening to loud music at rock concerts__________caused hearing toss in some teenagers.

选项 A.is
B.are
C.has
D.have

答案C

解析Listening to…是动名词短语作主语,故谓语动词用单数,根据caused可知用现在完成时的单数形式。
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