選A
因為happen沒有被動,所以C和D被排除
during the past 20 years是過去的一段時間
過去時不能表示這一意思
完成時可以表示
所以選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
為什么
A.have happened B.happened c.have been happened D.were happened
為什么
英語人氣：306 ℃時間：2019-08-20 21:53:59
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