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

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

admin2010-04-24  24
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 情态动词题。ought to have acknowledged表示本应该做的事情，而没有做，与本句句意相符。
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