单项选择题


A.While
B.Since
C.Because
D.Suppose
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单项选择题
A.gapB.blankC.intervalD.space
A.gap
B.blank
C.interval
D.space
单项选择题
A.percentageB.proportionC.rateD.ratio
A.percentage
B.proportion
C.rate
D.ratio
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