问题
选择题
They urged that the library ______ open during the vacation.
A．must be kept
B．is kept
C．would be kept
D．be kept
答案
答案：D
题目分析:考查虚拟语气。根据动词用法可知urge后面的宾语从句用should +动词原形，should可以省略，所以D选项正确。句意：他们强烈要求图书馆在假期开放。
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