题目内容

----I wonder how much for your services.
----The first two are free      the third one costs $30.
A．whileB．untilC．whenD．before
A

这里考查while做连词，表示“然而”，表示两句话的对比关系，句意是：我想知道你的服务多少钱？---前两个是免费的，而第三个是30美元。选A。
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