Don’t come in unless .A. invitingB. inviting toC. invited toD. being invited to

问题补充：

Don’t come in unless .

A. inviting

B. inviting to

C. invited to

D. being invited to

答案：

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。