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They will lose the game _______ they try their best.
A.unlessB.onceC.sinceD.after
A

试题分析:句意:除非他们尽他们的最大努力,否则他们会输掉比赛。unless 除非,如果不;once 一旦,曾经,一次;since自从;after 在…之后。根据句意可知选A。
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