There is no doubt they all passed the examination.A. ifB. whichC. thatD. whether

问题补充：

There is no doubt they all passed the examination.

A. if

B. which

C. that

D. whether

答案：

A. if

B. which

(答案→)C. that

D. whether

解析：这题考查句型：there is no doubt that…“毫无疑问…”，如果是：There is doubt就用whether…,句意是:毫无疑问他们会通过考试的。选C。