题目内容

7．-I wonder how much you charge for your services．
-The first two are free_____the third costs 30．（　　）
A．whileB．untilC．whenD．before

分析 --我想知道你的服务收费多少．
--最初的两次免费，而第三次30元．

解答 答案是A．本题考查从属连词辨析．While然而，表示两者间的对比转折；until到…为止； when 当…时；before 在…之前，根据题意可知，前两次和第三次进行对比，故选A．

点评 首先要理解连词的功能：并列连词连接并列的词、短语或句子；从属连词连接主从句；其次理解各连词含义；最后结合语境做出判断．

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