In America．a friend's inviting you to a restaurant doesn't mean that he or she will pay for the meal you are told in advance．
A. unless
B. if
C. although
D. until
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(答案→)A. unless
B. if
C. although
D. until
解析：考查连词。A除非，如果..不；B如果；C尽管；D直到；句意：在美国，朋友邀请你去餐厅并不意味着他/她会付账，除非你事先被告知。