-What's up? You look worried.Well,I_____on the problem for 5 hours but I haven't got a single clue.
#100541
A
have worked
B
worked
C
will work
D
have been working
推荐题目
I ______, but I was prevent by the heavy rain.
#104168
A
had meant coming
B
had meant to come
C
meant to come
D
meant coming
My cousin went to Canada two years ago. He ____ there for a few months and then went to America.
#100760
A
worked
B
would work
C
would be working
D
has been working
By the time Fred gets back home, his girlfriend for London to study.
#102733
A
will have left
B
leaves
C
has left
D
will leave
一You seem to be familiar with this city．一I_____ here for three years．It’s great to be back．
#99854
A
will live
B
lived
C
had lived
D
live
We are now in the age of great changes. Everything sometimes ________ before it is felt.
#99951
A
change
B
had changed
C
has changed
D
changed