There______great changes in our hometown over the past 15 years.A.has beenB.have beenC.wasD.were

分类: 作业答案 • 2021-12-20 02:27:53

问题描述：

答

have been.

答

has been

答

B.have been
changes是复数,over+时间段又是完成时态的典型时间状语,所以选B