—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
----Any news about Bill Clinton? ----He left power three years ago and has a little now and a little then been ______.
#104448
A
heard of since
B
heard since
C
heard before
D
heard of before
By the time I got to the office, the meeting ______.
#100849
A
had begun
B
began
C
was beginning
D
would begin
I _______ online games for two years, but I’ve never regretted giving it up.
#100083
A
play
B
was playing
C
played
D
had played
The old city wall ______ in the Ming Dynasty.
#103432
A
was been built
B
has been built
C
was built
D
had been built
---Where are your parents? ---They are in the kitchen, they ______the dinner for the party the whole day.
#100575
A
are preparing
B
have been prepared
C
have been preparing
D
were preparing