选A
因为happen没有被动,所以C和D被排除
during the past 20 years是过去的一段时间
过去时不能表示这一意思
完成时可以表示
所以选A
Great changes____ in our country during the past 20 years.
Great changes____ in our country during the past 20 years.
A.have happened B.happened c.have been happened D.were happened
为什么
A.have happened B.happened c.have been happened D.were happened
为什么
英语人气：419 ℃时间：2019-08-20 21:53:59
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