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）
(E) that shoots dead chickens at airplanes has proved helpful in demonstrating
看起来A和E的主要区别在shooting短语修饰和that shoots从句修饰上吧，那么这两种修饰方法到底有何区别呢？谢谢赐教！
helpful in doing something是固定用法。
名词修饰语，从句比分词的信息详细，有时态信息；分词比从句简练。
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