I'm sure it wasn't Mr. Phong you saw because he's on business in Ha Noi
A. It couldn't be Mr. Phong you saw because he's on business in Ha Noi
B. You mustn't have seen Mr. Phong because he's on business in Ha Noi
C. It can't have been Mr. Phong you saw because he's on business in Ha Noi
D. Mr. Phong is on business in Ha Noi, so you might have seen him
Chọn C
Kiến thức: Động từ khuyết thiếu
Giải thích:
A. couldn’t V: không thể làm gì trong quá khứ
B. mustn’t have P2: chắc hẳn đã không làm gì trong quá khứ
C. can’t have P2: không thể đã làm gì trong quá khứ (chắc chắn 99%)
D. mightn’t have P2: có thể đã không làm gì trong quá khứ
Tạm dịch: Tôi chắc chắn người bạn đã thấy không phải là anh Phong bởi vì anh ấy đang đi công tác ở Hà Nội.
= Người mà bạn đã thấy không thể là anh Phong vì anh ấy đang đi công tác ở Hà Nội
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