We _______ on it for several hours but we have not yet reached any conclusion.
#104695
A
work
B
areworking
C
havebeenworking
D
havebeenworked
推荐题目
----Did you see the manager in the office? ----Yes. He _______ by a journalist from China Daily.
#102517
A
had been interviewed
B
interviewed
C
has interviewed
D
was being interviewed
I won’t tell the student the answer to the math problem until he ____on it for more than an hour.
#99288
A
has been working
B
will have worked
C
will have been working
D
had worked
The people _____ the murderer everywhere when he suddenly _______ in the hospital.  
#102316
A
searched for; appeared
B
were searching; was appearing
C
were searching for; was appeared
D
were searching for; appeared