Students urged that the school library open during the long vacation.
A. be kept
B. kept
C. must keep
D. must be kept
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(答案→)A. be kept
B. kept
C. must keep
D. must be kept
解析：考查虚拟语气。动词urge后面的宾语从句使用“should+动词原形”构成的虚拟语气，should可以省略；句意：学生们催促学校的图书馆在很长的假期里也要开放。故A正确。