[练习题]Fill in the blanks with an item as required.With a modal verb:
If he had been more careful, he have made such a silly mistake.

正确答案：shouldn't

题目解析

modal verb为情态动词。should have done：本应该怎样，但实际上并没有怎样。shouldn't have done表示本来可以不怎样，但是实际上却怎样了。本句意为如果他再仔细一点，就不会犯这么愚蠢的错误。

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[练习题]Fill in the blanks with an item as required.​With a modal verb: If he had been more careful, he have made such a silly mistake.