Question

【题目】—Is the tall man over there our head teacher?
—No, it be him. He has gone to Shanghai for a meeting.
A.must
B.can't
C.can
D.mustn't

Answer 1

【答案】B
【解析】句意：-那边那个高个子的男人是我们的班主任吗？-不，他不可能是，他已经去上海开会了。must必须，一定；can't不可能；can可能，must会；mustn't禁止，不要。根据句意可知，这里表示推测，肯定句中用must；否定句用can't。故选B。