2. 外语
  3. They ______ to have done such silly things.

They ______ to have done such silly things.

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问题 They ______ to have done such silly things.
选项 A、had ought
B、hadn’t ought
C、didn’t ought
D、ought not
答案D
解析 根据句意；他们本不应该做这么蠢的事。 ought to 否定应为ought not to 。故本答案为[D]。
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