The research is so designed that once________nothing can be done to change it. 
#5001
A
begins
B
having begun
C
beginning
D
begun
推荐题目
---Thank for the ride home!-----______, which of the following is wrong?
#59045
A
Don’t mention it.
B
Not to mention
C
Not at all
D
That’s all right.
I didn’t get a_____in the list of contribution.
#5009
A
mentioned
B
mention
C
name
D
calling
Have you heard ______ news?The piece of _______ petrol is going up again!
#4937
A
the, the
B
不填,the
C
the, 不填
D
不填,不填