As long as there have been mice,people have sought a better mousetrap.这句话不懂.As long as there have been mice,people have sought a better mousetrap.这句话为什么用现在完成时?
问题描述：
As long as there have been mice,people have sought a better mousetrap.这句话不懂.
As long as there have been mice,people have sought a better mousetrap.这句话为什么用现在完成时?
答
表示一直延续到现在的，用完成时
答
因为这里（现在）已经有老鼠了，所以人们使用了更佳的老鼠钳。
因为“现在已经”，所以是现在完成时啊
答
只要这里已经有老鼠了,人们就会寻找更好的扑鼠器
have been 完成时,表示一直,已经