All possible means ____ to prevent the air pollution, but the sky is still not clear.
#100326
A
is used
B
has been used
C
are use
D
have been used
推荐题目
Mr. Lin _____ when I go to see him on Sundays.
#100147
A
is always working
B
was always working
C
always worked
D
has always worked
I am willing to have her again ________ our new flat and I _________her that, but it must be up to her own decision.
#104624
A
decorating; will tell
B
decorate; will tell
C
decorate; tell
D
decorated; tell
---- Why have you bought so much food ? ----My good friends ________ to stay with me for the weekend.
#100232
A
are coming
B
have come
C
come
D
will have come
He left his hometown in 1990, and great changes _________ ever since.
#99346
A
had taken place
B
took place
C
have been take place
D
have taken place
— Jenny, how many years have you studied in China?— I ________ here for three years by the end of this month.
#102230
A
study
B
have studied
C
will have studied
D
am studying