Question

【题目】—The tall man with glasses over there looks like our math teacher.
—It _________ be him. He has gone abroad.
A.may not
B.mustn't
C.can't
D.needn't

Answer 1

【答案】C
【解析】句意：——那边那个戴眼镜的高个子男的看起来像我们的数学老师。——不可能是他，他已经出国了。may not也许不；mustn't（表示禁止）千万不要；can't不可能；needn't不必。故选C。