下列哪个句型可以表达“委婉地提醒某人某件事”？（多选题)

A.Which of the following is true？

B.What is the professor' s opinion of …？

C.What is the professor' s attitude about/toward…？

D.How does the author think of...？

A.It is made of ..

B.It is featured by

C.It has many advantages, such as,

D.Something surprising happened…

A.The biggest difference between … and… is that

B.There are quite a few differences between …and

C.Something surprising happened

D.The main advantage of … is that…While the disadvantage is that

A.It seems to me that.

B.This is only my opinion but.

C.Last year during the Spring Festival, I

D.Those reasons explain why

A.subs(a+b,a,4)

B.subs(a+b,b,4)

C.subs(a+b,4,a)

D.subs(a+b,4,b)

E.subs(a+b,a,b)

F.subs(a+b,b,a)

A.Something surprising happened

B.The first thing you should do/need to do is

C.Currently, there is a phenomenon/increasing trend that

D.… has been prevalent in our society in recent years.

A.Our study has verified that this method is

B.We intend to do justice to the question of

C.Let me cite a few instances to illustrate my point

D.This is only my opinion but.