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One can’t do extreme sports _________ he or she has had some training.
A.ifB.unlessC.onceD.since
B

试题分析:句意:一个人不能做极限运动,除非他或她进行过一些培训。If如果; unless除非; once一旦; since自从,因为。根据句意故选B。
点评:本题难度适中。连词是近几年高考常考的语法项目,主要考查的是它们的用法及意义,还需正确理解句意及正确分析句子的成分才能做出正确的判断。这里考生容易误选A。
即学即练:All the dishes in this menu,_________ otherwise stated, will serve two to three people.
A. as        B. if      C. though       D. unless
解析:D。句意:考查连词的用法。句意为:除非有特别的说明,要不然这个菜单上的所有的菜只供两到三个人食用。unless表示“如果不……,除非……”,符合句意。
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