According to United States Air Force official, a cannon (shooting dead chickens at airplanes has proved helpful to demonstrate) what kind of damage can result when jets fly into a flock of large birds.
b、shooting dead chickens at airplanes has proved itself helpful as demonstration of
c、shooting dead chickens at airplanes proves itself helpful as demonstrating
d 、that shoots dead chickens at airplanes proves itself helpful to demonstrate
e、that shoots dead chickens at airplanes has proved helpful in demonstrating
请分析此题解题思路和告知prove 用法。谢了先。
请讲一下A、E的区别。晕啊！作者: zhyan 时间: 2002-12-20 14:35
E
1)shooting 应用 that shoots 来修饰,因为它不是表示一直在进行的动作
2)prove helpful in doing sth 从句意看表示在某方面有用,并非表目的作者: lucylu 时间: 2002-12-20 17:36
应选E。
PROVE的用法：
prove （oneself) to be +adj.其中to be 可省略。
另：be helpful in doing sth作者: knight 时间: 2002-12-20 21:19
