I’m sure it wasn’t Mr. Phong you saw because he’s in Hanoi.
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Choose the best answer amongA, B, C, or D which has the same meaning with the original sentence: I’m sure it wasn’t Mr. Phong you saw because he’s in Hanoi.
It couldn’t be Mr. Phong you saw because he’s in Hanoi.
You mustn’t have seen Mr. Phong because he’s in Hanoi.
It can’t have been Mr. Phong you saw because he’s in Hanoi.
Mr. Phong mightn’t see you because he’s in Hanoi.
Giải thích
Đáp án là C. can’t have done: để thể hiện suy đoán không chắc chắn