Question

Is ______ Qinghai-Tibet Railway plays an important role in China’s railway history the topic that you’re coming to?

1. A.
   it
2. B.
   that
3. C.
   what
4. D.
   this

Answer 1

B
试题分析：句意为：青海至西藏的铁路在中国历史上扮演着重要的角色就是你要谈到的话题吗？本句的正常语序为: ______ Qonghai-Tibet Railway plays an important role in China’s railway history is the topic that you are coming to. 所以此处应是主语从句，从句中不缺少成份。故答案应为B。
考点：考查名词性从句的用法。