A.as long as
B.unless
C.despite
D.till
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A.power
B.speed
C.resistance
D.thrust force
A.take；save
B.to take；save
C.take；to save
D.to take；to save
A.is used to be
B.was used to be
C.used to be
D.was used to
A.has left
B.had left
C.has been away
D.had been away
A.in
B.to
C.from
D.by
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