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情态动词+have done

(1)He _________(不可能完成)the work so soon.

(2)You _________(本能够)it well, but you were too careless.

(3)You _________(本没有必要)him.

(4)He _________(一定错过了)the train.

答案:
解析:

  (1)can't have done

  (2)could have done

  (3)needn't have done

  (4)must have done


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