Ladies and gentlemen, please fasten your seat belts. The plane         . 
#101851
A
takes off
B
is taking off
C
has taken off
D
took off
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
 Jimmy said that he would come to pick me up, but he _______ by now.
#104117
A
hasn’t turned up
B
doesn’t turn up
C
won’t turn up
D
hadn’t turned up
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