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
A
考查連詞的用法。這里起轉(zhuǎn)折作用,while表示”但是”,可接句子.”前兩個(gè)免費(fèi),但第三個(gè)要收費(fèi)30元”
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