问题
_____ is known to all is that effective measuresshould be taken to deal with the problem of the over-exploiting of ourresources.
A:What
B:It
C:As
D:Which
B:It
C:As
D:Which
正确答案是：
同类题型
You are notto smoke in the hospital.
Must I hand in my homework this evening, Mr. Wu—________________.
It is illegal for a public official to ask people for gifts or money ________ favors to them
It is said that Nan’ao Bridge is one of _______ bridges in China .
Sorry, Madam. You’d better come tomorrow because it’s ________ the visiting hours.