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
-I think the man over there must be Bob.-It ____ be him.He has gone to Australia.
-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
空格处为什么要用can't,不能用mustn't
英语人气：157 ℃时间：2020-01-25 14:12:43
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