– 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
—The country has already sent up an unmanned spacecraft to the moon.—Yes. Chang’e I to the moon last October.
#42072
A
has been sent
B
has sent
C
was sent
D
sent
－ How long _______ home?－For about three months.
#42182
A
have you been away from
B
did you leave
C
have you left
D
are you away from
—David, are you listening to me?—Sorry, Dad. I ________ to make sense of what the reporter said.
#63706
A
was trying
B
have tried
C
am trying
D
tried
—Excuse me, look at the sign “No photos!”—Sorry, I __________ it.
#36243
A
don’t see
B
didn’t see
C
haven’t seen
D
won’t see