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题型:单选题 题类:常考题 难易度:普通

江苏省如东中学、栟茶中学2018-2019学年高二上学期英语期末考试试卷

— When will the bike-sharing schemes be introduced to the public?

— Not until       a better understanding of them.

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