It is requested that each of the teachers invited a performance at the party.
A. should give
B. will give
C. has to give
D. must give
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(答案→)A. should give
B. will give
C. has to give
D. must give
解析：考查虚拟语气。动词require后面的宾语从句要使用“情态动词+动词原形”构成的虚拟语气，其中的should是可以省略的。故A正确。