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
—Must I turn off the gas after cooking?—Of course. You can never be ____ careful with that.
#4804
A
enough
B
too
C
so
D
very
---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.
No one knows exactly when our ancestors started talking，but new evidence suggests _______might have happened a long time ago．
#4852
A
which
B
what
C
it
D
they
Mr. Smith was so angry at all ______ Bill was doing ______ he left.
#59062
A
that; what
B
that; that
C
which; which
D
what; that