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解析：考查连词辨析。由对话语境可知，空格后的一句是空格前一句的前提条件。故A项意思相符。as long as只要。 答案：A 4．(2010·北京高考) ________ they decide which college to go to，students should research the admission procedures. A．As B．While C．Until D．Once 解析：此题考查状语从句连词。once“一旦……”。句意：学生一旦决定上哪个大学，他们就应该了解一下入学手续。 答案：D 5．(2009•浙江高考)The medicine works more effectively ________ you drink some hot water after taking it. A．as B．until C．although D．if 解析：as意为“因为，当……的时候”；until意为“直到”；although意为“尽管，虽然”；if意为“如果”。句意：如果你用一些热水服用，药的效果会更好。 答案：D 引导条件状语从句的词(组)主要有if“如果”，unless“如果不，除非”，so/as long as“只要”，on condition that “只要，条件是”，so/as far as“远到……”，if only“要是……就好了”，once“一旦”。注意：条件从句中的if不能用whether替换。 Once he has made up his mind，nothing can make him change his mind. 他一旦下定决心，什么也使他改变不了主意。 As long as you don't lose heart，you will succeed. 只要你不灰心，你会成功的。 I will do it on condition that you help me. 只要你肯帮助我，我就愿意做此事。 1．(2010·安徽高考)The engineers are so busy that they have | 
