单项选择题
A.world
B.airplane
C.area
D.knowledge
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单项选择题
A.keep upB.keep awayC.keep offD.keep on
A.keep up
B.keep away
C.keep off
D.keep on
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单项选择题
A.roundB.onC.inD.around
A.round
B.on
C.in
D.around
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