Question

---When will the railway that connects the two cities open?

---_____        next year.Only two thirds                            been built.

A. Until; has           B. Not until; has

C. Until; have          D. Not until; have

Answer

B

【解析】

试题分析：句意：——这条连接两个城市的铁路什么时候将开放？——直到明年才开放。只有三分之二已建成。Not until直到……才，Until直到……。据When will the railway that connects the two cities open?故选Not until；主语 Only two thirds （of the railway）是第三人称单数，故助动词也用第三人称单数has,故选B。

考点：考查连词及主谓一致。