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英语高水平人才请进.Theemergencyrequiredthatallthetasksatleasttwodaysaheadoftime.悬A.tocompleteB.shouldcompleteC.becompletedD,shouldhavebeencompleted为啥选C,不选D

题目详情
英语高水平人才请进.The emergency required that all the tasks __at least two days ahead of time.悬
A.to complete B.should complete C.be completed D,should have been completed 为啥选C,不选D
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答案和解析
其实是(should)be completed不过 should省略了.task是被完成.requrie有虚拟语气,后面从句要用上 时候should do .