---- Why does the river smell terrible? ---- Because large quantities of water______．
#99913
A
have been polluted
B
has polluted
C
has been polluted
D
have polluted
推荐题目
The manager found that his office ______ the day before.
#102032
A
had broken in
B
has been broken into
C
had been broken into
D
has been broken in
The two old sisters, so long, held each other and burst into tears．
#102459
A
being separated
B
having been separated
C
having separated
D
had been separated
—You look tired. —Yes. I _____ non-stop until twelve o’clock.
#103911
A
hasn’t been working
B
wasn’t working
C
was working
D
didn’t work
By the end of last year, another new gymnasium in Beijing.
#101885
A
would be completed
B
was being completed
C
has been completed
D
had been completed
-- Why do you look so worried? -- My computer broke down and my essay _____ since.
#103257
A
has been left unfinished
B
has left to finish
C
was left to finish
D
had been left unfinished