It is strange that such a thing in your school.
A. should happen
B. would happen
C. will happen
D. happened
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(答案→)A. should happen
B. would happen
C. will happen
D. happened
解析：考查虚拟语气的用法：It is strange that从句的谓语是should do，should可以省略，意为竟然，句意：很奇怪这样的事情居然在你们学校发生。选A。