— When will the bike-sharing schemes be introduced to the public?— Not until ___

题干

— When will the bike-sharing schemes be introduced to the public?
— Not until _______ a better understanding of them.

A．we have had	B．will we have had
C．have we had	D．we will have had

上一题下一题 0.65难度单项选择更新时间:2018-11-30 11:18:36

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