Hearing loss in a large number of teenagers______ caused because of their listening to loud music.
A．isB．hasC．a(chǎn)reD．have
A

試題分析：句意：大多數(shù)年輕人聽力的損傷是因為他們聽了特別大的音樂而引起的。Hearing loss in a large number of teenagers是動名詞短語做主語，當(dāng)動名詞短語做主語時謂語動詞用單數(shù)，這里句子的主語與cause之間是被動關(guān)系，故選A。
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