as unfriendly 是as to be unfriendly，还是 as being unfriendly 的省略形式

When I told him that I meant to live in Paris for a while, and had taken an apartment, he reproached me bitterly for not having let him know. He would have found me an apartment himself, and lent me furniture -- did I really mean that I had gone to the expense of buying it? -- and he would have helped me to move in. He really looked upon it as unfriendly that I had not given him the opportunity of making himself useful to me. Meanwhile, Mrs. Stroeve sat quietly mending her stockings, without talking, and she listened to all he said with a quiet smile on her lips.

请教老师：这一句He really looked upon it as unfriendly that I had not given him the opportunity of making himself useful to me.

it是形式宾语，后面的that I had...才是真正的宾语，那么，as unfriendly 是as to be unfriendly，还是 as being unfriendly 的省略形式呢？

这种as宾补后面，可以接哪些形式的词性呢？