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

分析 前兩項服務(wù)是免費的,然而第三項需要花費35元.

解答 答案:B.根據(jù)The first two services are free(前兩項服務(wù)是免費的)和the third costs 35(第三項需要花費35元)可知二者之間是對比轉(zhuǎn)折關(guān)系,所以答案是B while"然而".其他選項的含義分別是A"自從,因為";C"隨著,盡管";D"在…之前".

點評 考查從屬連詞.while 用作連詞時,有以下幾種含義:
1.意為"當…時候,和…同時",引導時間狀語從句.例如:
While I was watching TV,the bell rang.(我看電視時,鈴響了.)
2.意為"雖然,盡管",引導讓步狀語從句.例如:
While it was late,he went on working.(雖然很晚了,但他還在繼續(xù)工作.)
3.連接兩個并列句子,表示"對比"關(guān)系.例如:
He went out for a walk,while I stayed at home.(他出去散步了,而我卻呆在家里.)

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