--- I wonder how much you charge for your service.
--- The first two are free ______ the third costs $30.
A．whileB．untilC．whenD．before
A
考查連詞。While 意為然而，表對(duì)比， until直到  when當(dāng)……時(shí)候  before在之前
句意為，---我想知道你的服務(wù)要收多少錢(qián)？
-----前面兩個(gè)免費(fèi)，然而第三個(gè)要三十美元。
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