问题
选择题
—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
答案：A
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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—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
while表转折 “而, 然而”。根据句子意思, 前两份免费, 而第三份要$30。