Great()have taken place in our city in the past twenty years.

问题描述:

Great()have taken place in our city in the past twenty years.
A memories B chances C activities D changes

答案:D
A 记忆
B 机会,机遇
C 活动
D 变化,改变
句意:在过去的20年里,我们的城市发生了很大的【变化】.