There is no doubt everyone will unite and work for better days.A. whether B. thatC. whatD

问题补充：

There is no doubt everyone will unite and work for better days.

A. whether

B. that

C. what

D. how

答案：

A. whether

(答案→)B. that

C. what

D. how

解析：考查固定句型，There is no doubt that意思“毫无疑问……”，句子意思“毫无疑问每个人为了美好的明天将要团结工作”，所以选B