题目内容

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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