－Why does the river smell terrible?－Because large quantities of water______．
#100039
A
have been polluted
B
is being polluted
C
has been polluted
D
have polluted
推荐题目
一"Peter, have you got your new flat furnished?—Yes. I ______ some used furniture and it was a real bargain.
#100526
A
will buy
B
have bought
C
bought
D
had bought
-You seem to be familiar with this city.-I_______here for three years. It's great to be back.
#101043
A
would live
B
had lived
C
lived
D
live
Tom has been absent for two days．Do you know what _________ to him?
#103347
A
has happened
B
would happen
C
was happened
D
had happened
In 1960, this was the longest bridge that __________.
#104497
A
was ever built
B
had ever built
C
has ever been built
D
had ever been built
Three-fifths of the buildings____in the earthquake .
#103630
A
was destroyed
B
have destroyed
C
were destroyed
D
has destroyed