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 动名词短语作主语,句子的谓语动词用单数形式,根据主语与caused的主动关系,故选C。
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