Professor Wang is going to give us a lecture on the history of American literatu

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问题 Professor Wang is going to give us a lecture on the history of American literature, but when and where ______ yet.

选项 A、aren’t decided
B、hasn’t been decided
C、haven’t decided
D、haven’t been decided

答案 B

解析句末的yet提示此处需要完成时态，且这里的时间和地点应视为一个整体．要用单数形式的完成时被动语态，故选B。

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