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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.

解答 答案:B
本题考查了not until 位于句首时,句子使用部分倒装句的用法.部分倒装句的使用是:助动词\系动词|情态动词+主语+谓语  结合选项,故先排除A\D.再联系本句时态,说的是以后的事,故用将来时,最后答案为B.

点评 解答该类题时,首先要对选项用法有深刻的了解.确定它们各自不同于另外三项的用法,再结合选项,将其带入句中,一般语意逻辑通顺,即为正确答案.

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