1、句子主语【production 产量】与谓语动词【increase增加】应该是被动关系,产量是被增加的或人为增加的,所以要用【被动语态】.
2、由于有时间状语【this year】,表明【产量被增加】这一动作应该是已经发生过的,强调对现在造成的影响或结果,因此需要用现在完成时.
这两种形式合二为一就是【现在完成时的被动语态】.
祝你开心如意!
The production of grain has been increased by four times thi
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