We on it for several hours but we haven't yet reached any conclusion.
#99883
A
are working
B
work
C
have been worked
D
have been working
推荐题目
(2009年合肥市高三第一次教学质量检测)When you finish your work，don’t forget to put the tools back where they ．
#104902
A
are
B
will be
C
were
D
had been
—Has your former classmate come back from America?—Yes, he _____ there for 8 years.
#101701
A
has stayed
B
stays
C
stayed
D
had stayed
— Why do you do volunteer work in the North-West?— I___ to improve the lives of the children there through my efforts．
#99543
A
was trying
B
have tried
C
am trying
D
tried
Prices____ all the time and no one knows when they stable.
#101890
A
are going up; become
B
have been going up; will become
C
have gone up; will become
D
have been gone up; become