—I wonder how much you charge for your services.—The first two are free the
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 |
|
答案
| A |
解析
| while表转折 “而, 然而”。根据句子意思, 前两份免费, 而第三份要$30。 |
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