题目内容
14．They will lose the game _______ they try their best．（ ）| A． | unless | B． | once | C． | since | D． | after |
分析 除非他们尽他们最大努力，否则他们会输掉比赛．
解答 unless除非，如果不；Once一旦，曾经，一次；since自从；after在…之后．根据句意"除非他们尽他们最大努力，否则他们会输掉比赛．"此次应为unless引导的条件状语从句．故选A．
点评 此题考查条件状语从句的连词选择，注意连词引导的从句的类型．
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