—Why does the lake smell terrible?—Because large quantities of water______.
#101560
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
The vegetables didn’t taste very good. They _______ too long.
#100525
A
had been cooked
B
were cooked
C
have cooked
D
cooked
The five rings ____________the close unity and friendly meeting at the Olympics between athletes from five continents.
#101581
A
prove
B
represent
C
defeat
D
explain
The houses . They will be finished next year.
#102266
A
are built
B
have been built
C
are being built
D
were built
When he was alive, the old scientist used to say that knowledge ＿＿from practice and he gained his experience by doing a lot of practical work.
#104398
A
was coming
B
had come
C
comes
D
would come
A warm welcome ______ to the American guests at the airport tomorrow morning.
#102949
A
is given
B
has been given
C
is going to give
D
will be given