题目内容
Great changes __ in the city in the past 20 years, and a lot of factories ____.
A．have been taken place; have been set up
B．have taken place; have set up
C．have taken place; have been set up
D．were taken place; were set up
【答案】
C
【解析】
试题分析：句意：在过去的20年里，这个城市发生了巨大的变化，已经建立了许多的工厂。句中有in the past 20 years句子要用现在完成时，take place发生，无被动形式，set up建立，有被动形式，故选C
考点：时态
点评：动词的时态是学习英语过程中非常重要的知识。现在完成时表示动词在过去发生对现在造成的影响。现在完成时往往和already,yet,for+一段时间，since+点时间的时间状语连用。一般过去时只表动词在过去发生，一般现在时表示习惯性的动词或是客观真理、事实。
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