29.---- I wonder how much you charge for your services.---- The first two are fr

29.---- I wonder how much you charge for your services.---- The first two are fr

题型:不详难度:来源:

29.---- I wonder how much you charge for your services.
---- The first two are free ____  the third costs $30.
A.whileB.until  C.whenD.Before

答案
A
解析
考查连词的用法。这里起转折作用,while表示”但是”,可接句子.”前两个免费,但第三个要收费30元”
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