一道英语动词填空题填什么Grance and Shorley were very unhappy for _____(not invite) to the party .为什么填not being invited不填not invited形容词作分词什么时候be要省,什么时候不省?

问题描述:

一道英语动词填空题填什么
Grance and Shorley were very unhappy for _____(not invite) to the party .
为什么填not being invited不填not invited
形容词作分词什么时候be要省,什么时候不省?