—The windows are dirty.—I know. They _________ for weeks.
#102514
A
haven’t cleaned
B
didn’t clean
C
weren’t cleaned
D
haven’t been cleaned
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