问题
选择题
Great changes _________ in my hometown in the past 20 years.
A．took the place
B．have taken place
C．were taken place
D．took place
答案
答案：B
考查时态和语态。Take place发生，无被动语态，排除C；took the place是代替……的位置，不符合句意，排除A；再根据时间状语in the past 20 years，可知要用现在完成时态。所以选B。