The man you saw yesterday Mr. Brown, because he went to London on business last week. A.  can’t  have been     B.  mustn’t be    C.  can’t be   D.  mustn’t have been

The man you saw yesterday ……..….Mr. Brown, because he went to London on business last week.
A. can’t have been
B. mustn’t be
C. can’t be
D. mustn’t have been

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Đáp án: A

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