B 是现在完成式,不及物动词come 的完成式表示动作已经完成并对现在造成的影响.
A是现在完成进行式 表示这一动作从过去开始到现在还在继续,而且不及物动词come 也不可以表延续,用于这一时态.
I saw Tom yesterday.He ( )from England already.A.have been c
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