英语高手帮帮忙Never before have science and technology been so rapi

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/11 19:18:23

英语高手帮帮忙Never before have science and technology been so rapidly developing as it is today...
既然是have been done,为什么用developing呢?这样so rapidly develop,不可以吗

have修饰been,表示现在完成时.been和developing是另一个结构,表示进行时,如果理解比较困难,不妨把have been还原成原型be.之所以用developing而不是developed,是因为句末的today——它在这里是使用进行时的标志.

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