they plant trees in spring的被动语态Trees _____ _____ in spring,才两个空

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they plant trees in spring的被动语态Trees _____ _____ in spring,才两个空
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they plant trees in spring的被动语态Trees _____ _____ in spring,才两个空
they plant trees in spring的被动语态
Trees _____ _____ in spring,才两个空

they plant trees in spring的被动语态Trees _____ _____ in spring,才两个空
Trees are planted in spring.用被动语态更客观,有时就是不想让听众知道动作的发出这是谁,所以用被动态,因此,by them 可以省略.