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He is the only one of the students who ________ a winner of schoolarship for three years.
A.isB.has been
C.areD.have been
B

试题分析:句意:他是唯一的一个赢得三年奖学金的学生。这里who引导的是定语从句,它在从句中作主语,因为先行词被the only修饰,所以从句的谓语动词应该用单数,故排除CD;又因为从句中有时间状语for three years表示他是奖金的获得者从过去一直持续到现在,所以应该用现在完成时,故选B。
点评:本题难度适中。动词时态是高考的热点,英语的时态多,又很复杂,现在的高考不是纯粹考时态的问题,而是把它们放在一定的语言环境里,让考生根据特定的环境来确定答案。
即学即练:Experiments of this kind        in both the U.S. and Europe well before the Second World War.
A. have conducted    B. have been conducted  C. had conducted    D. had been conducted
解析:D。句意:“就在二战爆发前,美国和欧洲都进行过这种实验。”首先考虑语态,主语experiment与conduct构成动宾关系,谓语使用被动形式。题干中出现the second war是过去的时间点,before the second war是过去的过去,因此使用过去完成时。选D。
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