The first two services are free，______the third costs￡35. A．whileB．whetherC．wha_刷题宝

题干

The first two services are free，______the third costs￡35.

A．while

B．whether

C．what

D．which

上一题下一题 0.85难度单项选择更新时间:2012-11-15 07:34:19

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