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When and where to build the new library ____ yet.
A、is not decided
B、are not decided
C、has not decided
D、have not decided
【正确答案】：A
【题目解析】：句意：何时何地建新工厂还没有决定呢？When and where to build the new factory是疑问词+不定式作主语，而且何时何地为一个概念，所以谓语动词用单数，工厂是被建造，排除C。所以选A。