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Professor James will give up 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
現在完成時表示已經完成動作或從過去某個時候開始一直延續(xù)到現在的動作。根據時間狀語yet可判斷出要用現在完成時。因為when and where作decide的邏輯賓語，所以要用現在完成時的被動語態(tài)，表示“什么時候和地點還沒有確定”�，F在進行時表示說話時正在進行的動作或事件。
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