英语高手帮帮忙Never before have science and technology been so rapidly developing as it is today...
问题描述：
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
答
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.