—Why does the lake smell terrible? —Because large quantities of water _____.
#93664
A
have polluted.
B
is being polluted.
C
has been polluted.
D
have been polluted.
推荐题目
We narrowly escaped _____in the forest of South America 15 years ago.
#94023
A
killing
B
to be killed
C
to have been killed
D
being killed
I’ve worked with children before, so I know what ____ in my new job.
#95623
A
expected
B
to expect
C
to be expecting
D
expects
I was close to _______my life in the big earthquake, which is really a terrible experience .
#88891
A
lose
B
losing
C
have lost
D
being lost
____the problem of land erosion(侵蚀) getting more serious, the government is searching for a way to deal with it.
#95586
A
As
B
When
C
With
D
If
It was _____ computer games that cost the boy a lot of time that he ought to have spent on his lessons.
#98837
A
to have played
B
playing
C
played
D
having played