Listening to loud music at rock concerts ______ caused hearing loss in some teenagers.

A．isB．a(chǎn)reC．hasD．have

C

解析試題分析：考查時態(tài)，動作就已經(jīng)發(fā)生，對現(xiàn)在造成的影響，所以用現(xiàn)在完成式，因為主語是單數(shù)，所以用has，句子意思“聽大聲的搖滾音樂已經(jīng)造成一些青少年喪失聽力”，所以選C
考點：本題考查時態(tài)
點評：注意時態(tài)題，首先看時間狀語，由時間狀語來確定時態(tài)，如果是表示現(xiàn)在的時間狀語，就用一般現(xiàn)在式；如果是表示過去的時間，就用一般過去式；如果是表示將來的時間，就用將來時態(tài)。如果沒有時間狀語，就從暗含的意思找時態(tài)。

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For any information about AWL’s books, please get in touch with the following addresses:
Beijing Addison Wesley Longman Information Center
Room 2306, FLTRP Beijing
19 Xi San Huan Beilu, Beijing 100081
Tel: （010)68917488 （010) 68917788
Fax: （010) 68917499E-mail: zrh@public．bat．net．cn
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