I’m sure that they had practiced hard for the games as they won a lot of medals.

48/50

They couldn’t have practiced hard for the games as they won a lot of medals

They must have practiced hard for the games as they won a lot of medals

They shouldn’t have practiced hard for the games as they won a lot of medals

They might have practiced hard for the games as they won a lot of medals.

Giải thích

Kiến thức về câu với cụm khiếm khuyết hoàn thành để suy đoán

Must have Ved-3 :chắc chắn , ắt hẳn đã gần nghĩa nhất với câu gốc

I’m sure that they had practiced…(Tôi chắc rằng họ đã…..)

Xét đáp án chọn B.