题目内容：

is that tom over there?no,it___be him ---i am sure he is much taller.a.must not b.may not
c.won"t d.can "t 选哪个 为啥啊

优质解答

选D,由i am sure he is much taller可知,说话者确定那不是Tom,所以用can't,表示不可能；must not 表示禁止、不准；.may not表示可能不,是不确定的猜测；won"t则表示将来不会