问题
It is _____ problem that none of us can work it out.
A:so difficult
B:such difficult a
C:such difficult
D:so difficult a;
B:such difficult a
C:such difficult
D:so difficult a;
正确答案是：
同类题型
No government can justly claim authority ______ it is based on the will of the people
Do you often visit your grandparents? — Mmm… ________ , I’m afraid. I usually phone them.
It took Linda an hour_____ her home-work last night.
I think you need more ________ before the competition,if you want to win.