I'm sure it wasn't Mr. Phuc you saw yesterday because he's on business.
A.It couldn't be Mr. Phuc you saw yesterday because he's on business.
B.You mustn't have seen Mr. Phuc yesterday because he's on business.
C.It can't have been Mr. Phuc you saw yesterday because he's on business.
D.Mr. Phuc mightn't see you yesterday because he's on business.

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