–I wonder how much you charge for your service.
--The first two are free____ the third costs $30.
A．beforeB．a(chǎn)sC．whenD．while
D
連詞辨析。Before在……之前；as 因?yàn)�，盡管；when當(dāng)……時(shí)候；while
然而，表前后對(duì)比。句子是說(shuō)前兩個(gè)免費(fèi)而第三個(gè)30美元。表示前兩個(gè)和第三個(gè)對(duì)比，所以選D。
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