【单选题】 Mary ______ that the purchase had been a mistake. However, she didn't.
A．ought to acknowledged
B．ought to have acknowledged
C．should acknowledge
D．should be acknowledging
网考网参考答案：B
网考网解析：
然而，她没有。虚拟语气题。ought to have acknowledged是虚拟语气，与本句句意相符。
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