()Don"tstandupinclassuntilyou___to.Doyouunderstand.A.askB.willaskC.areaskedD.wereasked说明理由.
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题目内容：
( )Don"t stand up in class until you ___to.Do you understand .A .ask B .will ask C .are asked
D.were asked
说明理由.
优质解答
C 被动语态
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