题目内容

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

A。根据句意，此处应用被动语态，不用主动语态; 再根据句末的yet可知，最好用现在完成时。故选A最佳。
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