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