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Wang Xuan is a famous computer scientist...

Wang Xuan is a famous computer scientist. He         his research of laser typesetting in 1975.

A.start B.started C.is starting D.will start

 

B 【解析】 句意:王选是一位著名的计算机科学家。他在1975年就开始了激光照排的科学研究。 考查一般过去时。start一般现在时;started一般过去时;is starting现在进行时;will start一般将来时。分析句子可知,句中时间状语是“in 1975”,表示一般过去时,所以空格处填started。故选B。  
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