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Class regulations require _____ is the last to leave the classroom _____ off all the lights.
A.who; should turnB.whom; shall turn
C.whomever; turnsD.whoever; turn
D
考查名词从句的连词和虚拟语气用法。主语从句中缺少主语,故用whoever="the" person who, require后接宾语从句,句中动词用(should)do。
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