选择Whom/Who is that man over there?(请注明理由)

问题描述:

选择Whom/Who is that man over there?(请注明理由)

who/whom都可以
如果是who,则在句中的成份即可是主语也可是表语.
如果是whom,则在句中的成分只能是表语这道题到底选什么啊,又没有上下文.选who肯定没错,但如果答案里没有who,退而求其次的选择是whom