-I think the man over there must be Bob.-It ____ be him.He has go_英语解答

-I think the man over there must be Bob.-It ____ be him.He has gone to Australia.
空格处为什么要用can't,不能用mustn't

人气：371 ℃　时间：2020-01-25 14:12:43

解答

这是否定的推测只能用can't
mustn't表示“必须不”表示禁止类似的意思,不可用作推测