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----When did you go to bed last night, Tom?----At 10 pm. But my mother___________,
#52044
A
is working
B
works
C
was working
D
worked
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Tony knows China very well because he ______ in China for twenty years.
#52882
A
works
B
was working
C
will work
D
has worked
Aron ______ water five days later.
#53451
A
ran out
B
used out
C
ran out of
D
used out of
 Rather than      to school by bus, I preferred       a bike.
#52853
A
to go; to ride
B
go; riding
C
going; to ride
D
go; to ride
—When will the plane     ?--In about fifteen minutes．
#58897
A
take down
B
take away
C
take out
D
take off
—Look, there_____ many birds around here, but now we hardly see them. What a pity!—Yeah! The air pollution has caused the problem!
#56353
A
are
B
used to have
C
used to be
D
use to be