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Sally has been swimming ______ four hours.   
#50710
A
for about
B
since
C
about
D
/
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-I think exercising every morning is good for our health.-Yes. I agree         you.
#48179
A
to
B
with
C
at
D
for
Wei Fang is young,but she plays ping-pong ____ her mother. 
#50705
A
as good as
B
as well as
C
as better as
D
as best as
Computers have made a great difference _______ our everyday life.
#50558
A
with
B
of
C
to
D
for
Is there a TV _________your classroom? Yes, of course.                                                                                                                                                                                                                                                                                                                                                                                                                              
#48923
A
in front
B
in the front
C
in front of
D
in the front of
He’s staying there _____ two weeks.
#50493
A
about
B
for
C
in
D
with
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