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：A
此题考查含有情态动词的被动语态的基本结构，情态动词+be+done。此题的含义表示他们强烈要求在假期开放图书馆。
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