Considering that Tom always did well in all his subjects,he

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/17 16:08:46

Considering that Tom always did well in all his subjects,he ____ in the final exam.
A.mustn't fail B.couldn't have failed C.ought not to fail D.mustn't have failed
我选的C,为什么C不对?

这是考察情态动词表示推测的用法.其中表示对过去的情况进行肯定的推测,用 must + have + done.表示对过去的否定推测,用 can't / couldn't + have + done,意为“不可能做过.”.本题是意思是：要是汤姆在所有学科方面都学得很好的话,他的期末考试就不可能会考咂了.而 ought not to fall 则意为不应该,指现在的或将来的情况.希望对你有点帮助
再问：句意应该是：考虑到汤姆在所欲学科方面都学的很好，他不应该（不可能）在期末考试中失败。翻译的话不应该和不可能都可以吧，主要是看时态，对吗？
再答：是的，我认为是这样

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