—I wonder how much you charge for your services.—The first two are free, _______

题干

—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

上一题下一题 0.4难度单项选择更新时间:2012-06-13 05:58:02

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