There is no doubt they did a completely bad job at that very moment.A. whichB. whetherC.

问题补充：

There is no doubt they did a completely bad job at that very moment.

A. which

B. whether

C. how

D. that

答案：

A. which

B. whether

C. how

(答案→)D. that

解析：句意：毫无疑问在那个非常时刻他们做的是完全坏的工作。这里用There is no doubt that….句型，that连接的是同位语从句，说明doubt的内容，如果这句话是肯定句：There is doubt …后面应该是whether连接同位语从句，所以选D。