大全055

reginaer

According to United States Air Force officials, 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 itself helpful to demonstrate
(E) that shoots dead chickens at airplanes has proved helpful in demonstrating

答案是E)，请问A错哪里，如果改成shooting dead chickens at airplanes has proved helpful in demonstrating对吗，是prove的用法问题吗

audiencer

A helpful to 错

另外定语从句表示具体的一次性的，分词结构表示反复的，持续的动作。

xiaoxiugirl

a canno shooting ... is a running sentence (part)

moodraie

shooting means keeping shooting

开若兰

QUOTE:

以下是引用audiencer在2009-4-3 17:14:00的发言：

A helpful to 错

 

下面这个金山词霸上面的例句表明 ... helpful to ... 也是一种正确用法。

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