---- I wonder how much you charge for your services． ---- The first two are free
题型：不详难度：来源：
---- I wonder how much you charge for your services．
---- The first two are free ____ the third costs $30．| A．while | B．until | C．when | D．before |
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答案
| A |
解析
| 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。 |
举一反三
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