A fire broke out in the neighborhood last night. By the time the firemen arrived, it    . 
#101011
A
had been put out
B
would put out
C
has been put out
D
was putting out
推荐题目
 — The floor is dirty.— Yes. It _______ for two days.
#99920
A
hasn’t swept
B
didn’t sweep
C
hasn’t cleaned
D
hasn’t been cleaned
The workers ___ busily when the boss came to look for something she ___ in the office.
#103985
A
had worked; had left
B
were working; had left
C
working; had left
D
had worked; left