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

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1. (2019高三上·江苏月考) — 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

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备考2020年高考英语一轮复习27：状语从句