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Professor James will give us a lecture on the Western culture, but when and where ____ yet.
A.hasn’t been decidedB.haven’t decided
C.isn’t being decidedD.aren’t decided
A

试题分析:考查时态和主谓一致。句子的主语是when and where指一件事情的两个方面,仍然使用单数形式。句意:James教授将会给我做一个关于西方文化的演讲,单数何时何地还没有确定。根据yet说明使用现在完成时。故A正确。
点评:当when and where做句子的主语时,谓语动词用单数的形式。
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