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--- When will the bike-sharing schemes b...

--- 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

 

D 【解析】 考查not until 位于句首时,句子使用部分倒装句的用法。句意: ---什么时候共享单车计划才会向公众开放呀?---直到我们对他们有一个更好的了解的时候,就会开放了。not until位于句首时主句部分倒装,而until引导的时间状语从句不用倒装。再联系本句时态,说的是以后的事,所以主句用将来时态,从句用现在时态,故选D。  
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