问题
选择题
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
答案
答案：A
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。