单项选择题
A.on
B.by
C.at
D.against
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单项选择题
A.BecauseB.WhileC.SinceD.When
A.Because
B.While
C.Since
D.When
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单项选择题
A.portionB.percentageC.proportionD.fraction
A.portion
B.percentage
C.proportion
D.fraction
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