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_______ you start, you should go ahead.
A.OnceB.BeforeC.UntilD.Though
A

试题分析:句意:一旦你开始,你就应该继续。once一旦;before在……以前;until直到……才;though虽然,尽管。根据句意故选A。
点评:本题难度适中。连词是近几年高考的热点,主要考查从句中的连词所作的成分,它们的区别及意义。需要考生会正确分析复杂的句子结构的能力,能够正确理解语境。这里考生容易误选D。
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: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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