问题
选择题
Don’t come in unless ________.
A．inviting
B．inviting to
C．invited to
D．being invited to
答案
答案：C
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。