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20．When will the bike-sharing schemes be introduced to the public？
Not until____________ a better understanding of them．（　�。�
A．we have hadB．will we have had
C．have we hadD．we will have had

分析 ---什么時候共享單車計劃才會向公眾開放呀？
---直到我們對他們有一個更好的了解的時候，就會開放了．

解答 答案：B
本題考查了not until 位于句首時，句子使用部分倒裝句的用法．部分倒裝句的使用是：助動詞\系動詞|情態(tài)動詞+主語+謂語  結合選項，故先排除A\D．再聯(lián)系本句時態(tài)，說的是以后的事，故用將來時，最后答案為B．

點評 解答該類題時，首先要對選項用法有深刻的了解．確定它們各自不同于另外三項的用法，再結合選項，將其帶入句中，一般語意邏輯通順，即為正確答案．

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