Câu 31 (TH): 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.
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