Question

【题目】—Look！Our math teacher is standing outside our classroom.

—It ________ be him.He has gone to his office.

A. mustn't B. might C. may not D. can't

Answer 1

【答案】D

【解析】句意：看！我们的数学老师站在教室外面。——不可能是他，他去办公室了。情态动词可以表示推测，A. mustn't 绝对不是；B. might 可能； C. may not可能不；D. can't不可能，一定不。结合语境理解，答案为D。