Question

There is no doubt _____ China has made rapid progress in space exploration.

A． whether

B． that

C． which

D． who

Answer 1

B

句型：There is no doubt that 毫无疑问，这也是一个同位语从句，句意：毫无疑问中国已经在太空探索中取得了快速进步。所以选B。