George won five medals at the competition. His parents _____ very proudof him.

Câu hỏi :

George won five medals at the competition. His parents _____ very proud of him.

A. could have been

B. can’t have

C. can’t be

D. must have been

* Đáp án

D

* Hướng dẫn giải

Must have Vpp => chắn hẳn đã là ....

Diễn tả sự suy đoán có logic, chắc chắn

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