The committee __ over the problem among themselves for two hours. 
#100019
A
has argued
B
has been arguing
C
have argued
D
have been arguing
推荐题目
_____ in the queue for an hour,Tom suddenly realized that he had left his wallet at home.
#103270
A
To wait
B
Have waited
C
Having waited
D
To have waited
 ______ of danger in the street at night, she had to go home with a friend ____ her.
#101689
A
Warning; following
B
Having warned; following
C
Warned; followed
D
Having been warned; following