Mary ______ that the purchase had been a mistake. However, she didn’t.A、ought to

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问题 Mary ______ that the purchase had been a mistake. However, she didn’t.

选项 A、ought to acknowledged
B、ought to have acknowledged
C、should acknowledge
D、should be acknowledging

答案 B

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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