-Are you going to the party_at Smith's home this evening?-I will if I am free

问题描述:

-Are you going to the party_at Smith's home this evening?-I will if I am free
A、holding B、held C、to hold D、to be held
答案是D为什么啊

因为这里强调的是将要举行需要加to,而party事物,要用被动含义,故此用to be held
B项语法上是可以上用的,但不强调将来,只是表明实际情况.