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

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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