Listening to loud music at rock concerts       caused hearing loss in some teenagers.
A．isB．a(chǎn)reC．hasD．have
C

試題分析：非謂語動詞作主語謂動詞為單數(shù)故為A或者C,聲音太大導(dǎo)致了失鳴是主動關(guān)系。故排除Ａ
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