求助！定语从句还是分词短语呢？

littlesharon

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.

(A)shooting dead chickens at airplanes has proved helpful to demonstrate

(B)shooting dead chickens at airplanes has proved itself helpful as a demonstration of

(C)shooting dead chickens at airplanes  proves itself  helpful as  demonstrating

(D)that shoots dead chickens at airplanes  proves helpful to demonstrate

(E)that shoots dead chickens at airplanes  has proved helpful in demonstrating

[此贴子已经被作者于2008-9-11 11:45:34编辑过]

littlesharon

这道题目的答案是e，可是我觉得a更合适呀！

littlesharon

foxlian

In restrict clause "that" is better than "doing"

AlienX

umm...LZ的E....打多了一個to
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A: shooting dead chickens at airplanes has proved helpful to demonstrate=that has shot dead chickens at airplanes has proved helpful to demonstrate

usages:
- It is helpful to [do something]
- helpful in [doing something]

littlesharon

以下是引用foxlian在2008-9-11 6:13:00的发言：
In restrict clause "that" is better than "doing"

为什么呢？我觉得更倾向于状态，不是指某次动作吧？

rettymo

the key is the use of 'helpful'

'be helpful in doing sth' is always the right one.

remember this. should be useful~

littlesharon

嗯，找到答案了。

谢谢楼上的。

2．Help用法

help somebody to do something,help (to do) something.helpful in doing