–I’ll ask the teacher about the noun clause. I’m very puzzled about it.
--That’s just most of us have doubt.
A. what
B. why
C. where
D. how
网友回答
A. what
B. why
(答案→)C. where
D. how
解析：我要问老师名词性从句，我对它非常不解。那也正是我有疑问之处。Doubt为不及物动词不能接宾语所以不选what,而选用where作状语，所以答案为C。