Don’t e in unless .
A. inviting
B. inviting to
C. invited to
D. being invited to
网友回答
A. inviting
B. inviting to
(答案→)C. invited to
D. being invited to
解析：考查省略。句意“不要进来，除非（你）被邀请。”即unless you are invited to...；“邀请某人做某事”invite sb. to do sth.，被动形式是sb. Be invited to do sth.。故选C。