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Great changes ______in his hometown in the last twenty years.
A.were taken placeB.have taken placeC.have been taken placeD.took place
B

试题分析:考查时态。本句中的关键词是in the last twenty years,该时间状语通常和现在完成时连用,而且take place没有被动语态的形式。句意:在过去的20年里,他的家乡发生了巨大的变化。故B正确。
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since, so far等经常与现在完成时连用。在条件状语从句中用一般现在时代替将来时等等。
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