Do you doubt he’ll be fired by the school?- No not a bit. But I doubt he will bu

问题补充：

--- Do you doubt he’ll be fired by the school?

--- No, not a bit. But I doubt he will bury himself into study.

A. that; that

B. whether; /

C. if ; that

D. that; whether

答案：

A. that; that

B. whether; /

C. if ; that

(答案→)D. that; whether

解析：考查doubt的用法;在否定句和疑问句中，doubt后面接that引导的宾语从句。在肯定句中，doubt后面一般接whether或if引导的宾语从句。句意：你怀疑他会被学校开除吗？--不，一点也不，但我怀疑他是否会埋头学习。选D。