In American, a friend inviting you to a
问题:
In American, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.
A.until
B.unless
C.although
D.if
In American, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.
A.until
B.unless
C.although
D.if