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

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

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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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