Ladies and gentlemen, please fasten your seat belts. The plane _______. 
#104701
A
takes off
B
is taking off
C
has taken off
D
took off
推荐题目
What do you think ____________ at this time last night?
#101008
A
has he done
B
he has done
C
was he doing
D
he was doing
I _____ on a sofa because my grandparents have come for the weekend.
#104156
A
slept
B
was sleeping
C
have slept
D
am sleeping
—How long            in America?—Two years. I came back last month.
#101175
A
have you studied
B
do you study
C
would you study
D
did you study