Question

【题目】–Is that man Tom ? ---It ____ be him . He has gone to New York _____ business.
A.may not ; on
B.can't , on
C.mustn't . in

Answer 1

【答案】B
【解析】句意：——那人是Tom吗？——不可能是他，他已经去纽约出差了。may not也许不；can't不可能；mustn't表示禁止，一定不要。词组：on business出差。故选B。