[求助]比较困惑，谢谢大家解答

3.     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.D 

(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）

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

正选是E，我选的D，请问D的时态有什么问题;再有如果完成时是正确的选项，那么A是不是也没问题呢，谢谢大家解答

这是分词做定语和定从做定语的区别

分词做定语强调一个行为重复发生 如法律 自然现象

定从做定语是强调一个行为的一次性发生 不强调重复 如新闻 事情

在这道题中鸡只能被射死一次 不可能死来死去

所以在DE中选

D中搭配不对

选E