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题型:单选题 题类:常考题 难易度:普通

江苏省新草桥中学2019届高三上学期英语12月月考试卷

— 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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