I’m sure that they had practiced hard for the games as they won a lot of medals. A. They couldn’t have practiced hard for the games as they won a lot of medals. B. They must have practiced ha

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

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

B là đáp án đúng

Kiến thức: động từ khuyết thiếu

Giải thích:

- couldn’t + have + Vp2: đã không thể xảy ra

- must + have + Vp2: chắc hẳn đã làm gì (suy đoán có căn cứ ở quá khứ)

- shouldn’t + have + Vp2: lẽ ra đã không nên làm gì

- might + have + Vp2: có lẽ, có thể đã làm gì

=> Trong câu có “I’m sure” => suy đoán có căn cứ => chọn đáp án B

Dịch nghĩa: Chắc hẳn họ đã luyện tập chăm chỉ cho trận đấu vì họ đã giành được rất nhiều huy chương.