【題目】Listening to loud music at rock concerts _________ caused hearing loss in some teenagers.

A. is B. are C. has D. Was

【答案】C

【解析】

試題分析：句意：在搖滾演唱會(huì)聽(tīng)音量大的音樂(lè)已經(jīng)在青少年的身上造成了巨大的聽(tīng)力損失。根據(jù)caused可以看出本題是考查現(xiàn)在完成時(shí)，has done.，所以選擇C項(xiàng)。

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