Many trees ___(plant) in our school yard these years.1.have been planted 2.are planted选哪个?为什么?

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Many trees ___(plant) in our school yard these years.1.have been planted 2.are planted选哪个?为什么?
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Many trees ___(plant) in our school yard these years.1.have been planted 2.are planted选哪个?为什么?
Many trees ___(plant) in our school yard these years.1.have been planted 2.are planted
选哪个?为什么?

Many trees ___(plant) in our school yard these years.1.have been planted 2.are planted选哪个?为什么?
1.have been planted
1)树是被种植,应该用被动
2)these years ,这些年是延续的时间,用现在完成时

1-----现在完成时的被动语态

have been planted

选1
理由:these years是一段时间用完成时;树是被种,用被动。