– Look at these factories. I hate them. They____ many rivers here. --Yes. Something ______ to stop the pollution.
#39701
A
polluted, must do
B
had polluted , must be doing
C
have polluted , must be done
D
were polluting, must be done
推荐题目
I won’t leave my office until my work .
#39977
A
finishes
B
will be finished
C
is finished
D
will finish
— The floor is clean and dry now. Who _______?— Sorry, I don’t know.
#41742
A
mopped it up
B
has mopped it up
C
has mopped up it
D
mopped up it
—Have you watered the plants yet, Kathy? —Yes. I ________ that this morning.
#37014
A
will do
B
did
C
have done
D
was doing
When I was walking in the street, I saw a plane___________ over my head.
#42508
A
flies
B
flying
C
flew
D
fly
– You seem to know much about the city.– That’s true. I _______ it four times in the last three years.
#41988
A
visited
B
am visiting
C
have visited
D
will visit