–I wonder how much you charge for your service. --The first two are free____ the
题型：不详难度：来源：
–I wonder how much you charge for your service.
--The first two are free____ the third costs $30.| A．before | B．as | C．when | D．while |
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答案
| D |
解析
连词辨析。Before在……之前；as 因为，尽管；when当……时候；while
然而，表前后对比。句子是说前两个免费而第三个30美元。表示前两个和第三个对比，所以选D。 |
举一反三
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