题干
I have some doubt ____ his words, but _______ is no doubt that he has passed the exam.
A：about; it
B：of; that
C：about; there
D：to; he
答案(点此获取答案解析）
C
A：about; it
B：of; that
C：about; there
D：to; he
中，若
，则
等于（ ）