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13.The first two services are free,__________the third costs 35.(  )
A.sinceB.whileC.asD.before

分析 前两项服务是免费的,然而第三项需要花费35元.

解答 答案:B.根据The first two services are free(前两项服务是免费的)和the third costs 35(第三项需要花费35元)可知二者之间是对比转折关系,所以答案是B while"然而".其他选项的含义分别是A"自从,因为";C"随着,尽管";D"在…之前".

点评 考查从属连词.while 用作连词时,有以下几种含义:
1.意为"当…时候,和…同时",引导时间状语从句.例如:
While I was watching TV,the bell rang.(我看电视时,铃响了.)
2.意为"虽然,尽管",引导让步状语从句.例如:
While it was late,he went on working.(虽然很晚了,但他还在继续工作.)
3.连接两个并列句子,表示"对比"关系.例如:
He went out for a walk,while I stayed at home.(他出去散步了,而我却呆在家里.)

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