一道改错题

显示全部楼层 · 2011-3-4 22:51:36

It is estimated that a scientific principle has a life expectancy of approximately a decade before it drastically revised or replaced by newer information.
estimated为A处
a life expectancy为B处
decade为C处
it drastically 为D处
我觉得是B 将expectancy改为expected
请详细解答
题中有the ONE must be changed

千问 · 2011-3-4 22:51:36

D 改为 it is drastically revised or replaced一个原理应该被人们改变或者被其它新理论代替哈B是对的 a a life expectancy指的寿命期望值这个表达是正确的

千问 · 2011-3-4 22:51:36

D处有错，应该用被动语态 it drastically isB处life expectancy 是固定用法

千问 · 2011-3-4 22:51:36

D 处应当为 it is drastically 。。。(被动语态)