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    精英家教网 > 高中英语 > 题目详情
    The emergency required that all the tasks _____ at least two days ahead of time．
    A．to complete   B．should complete  C．be completed Dshould have been completed
    C
    考查虚拟语气。句意：紧急需要要求所有任务必须最少提前两天完成。“should+have+done”意思是“本来应该做某事，而实际没做。Task是被完成的对象，故用被动语态，选C。
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