题目

 Many a student _______ wearing MP3 players while walking on the street. It’s quite dangerous. A. is used to                                             B. are used to C. was used to                                                 D. were used to 答案：【解析】选A。考查主谓一致和动词时态。many a/an+单数名词作主语，谓语使用单数，故排除B和D两项；从后面的It’s quite dangerous. 可知句子谓语使用一般现在时，故选A。

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