单项选择题
A.that
B.it
C.some
D.one
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单项选择题
A.on and onB.by and byC.downD.over
A.on and on
B.by and by
C.down
D.over
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单项选择题
A.downB.awayC.onD.over
A.down
B.away
C.on
D.over
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