I don't doubt he will pass the exam.A. whetherB. that C. whenD. how

问题补充：

I don doubt he will pass the exam.

A. whether

B. that

C. when

D. how

答案：

A. whether

(答案→)B. that

C. when

D. how

解析：考查宾语从句。That he will pass the exam是一个宾语从句，that引导起它。因为前面是don doubt，所以后面应该是肯定的事情。句意：我不怀疑他会通过考试。