There is no doubt smoking can seriously damage our health.A. thatB. whetherC. whyD. which

问题补充：

There is no doubt smoking can seriously damage our health.

A. that

B. whether

C. why

D. which

答案：

(答案→)A. that

B. whether

C. why

D. which

解析：考查There is no doubt that…结构。Doubt作名词时，用在否定句中，后面跟that引导的同位语从句。所以选A。