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Youngpeopletendtogetupverylateunlesstoriseearly.A.requiredB.requiringC.theywererequiredD.torequire

题目详情

Young people tend to get up very late unless ________ to rise early.
A.required B.requiring C.they were required D.to require
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答案和解析
A

考查非谓语动词。当unless引导的状语从句与主句主语一样时,可以省略,用they are required,故选A。