解答:应该是be arrived(已经到了)。
解析及延伸:
1)动词原形不能作表语,不能说He is arrive,可以说"He has arrived / is arrived. 他已经到了。”
2)arrive是不及物动词,其过去分词arrived可以作表语、定语或者宾补,但不表示被动关系,而是表示主动关系。例如:
We should care for these newly arrived guests . 我们应该关心这些新来的客人。( = We should care for these guests who have just arrived. )
All the students are arrived. 所有的学生都到了。(= All the students have arrived.)
We found the teachers arrived. 我们发现老师们已经到了。(= We found (that) the teachers had arrived. )
类似的不及物动词还有rise,fall,retire, go,come, escape等。例如:
Spring is come. 春天来了。(=Spring has come. )
The sun is risen.太阳升起来了。(= The sun has risen. )
They saw the leaves fallen. (= They saw (that) the leaves had fallen. )
I find my wallet gone. 我发现钱包不见了。(= I find (that) my wallet has gone. )
I know this retired worker. (= I know this worker who has retired. )
The police are searching for the escaped prisoner. 警察正在搜寻这个逃犯。(= The police are searching for the prisoner has escaped. )