Listening to loud music at rock concerts______caused hearing loss in some teenagers.

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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 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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