高等继续教育 / 旅游英语
正确率：100%
题型描述: 单选题
It is obvious to the students _ _ _ _ _ _ they should get well prepared for their future.
A.whether
B.that
C.as
D.which
It is obvious to the students _ _ _ _ _ _ they should get well prepared for their future.
A.whether
B.that
C.as
D.which
参考答案：