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---- I wonder how much you charge for your services.
---- The first two are free ____  the third costs $30.
A.whileB.until  C.whenD.before
A
考查连词用法。本题考查了while表示转折的用法,意为:然而;句意:—我想知道这服务你要收多少钱?—最先的两次免费,而第三次收费30。
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