Every possible means to prevent the air pollution, but the sky is not still clear.
#101886
A
is used
B
are used
C
has been used
D
have been used
推荐题目
Don’t worry. The hard work that you do now ______later in life.
#102150
A
will be repaid
B
was being repaid
C
has been repaid
D
was repaid
— That’s the third time he’s won the award in this field.— Yes. He ______ his maximum potential in the past decade.
#102467
A
explored
B
is exploring
C
has been exploring
D
has explored
The young boy has come to himself in hospital now. But he ___ unconscious for three days.
#99850
A
has been
B
was
C
had been
D
is
Tim, ______ you ______ your homework yet?
#103227
A
were, finish
B
have, finished
C
are, finished
D
do, finish
—What's that terrible noise?—The neighbors ________ for a party.
#99161
A
have prepared
B
are preparing
C
prepare
D
will prepare