请教BY白勇语法第四章33题（p101）

lyen_wang

According to United States Air Forces 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 has proved itself helpful to demonstrate

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

BY答案E

解释认为-ing分词强调动作的多次性和重复性，而that定于从句强调动作一次性，强调具体行为，符合题意

但我认为，既然这里被prove helpful的是用大炮将死鸡射向飞机这整个行为，就不应是答案E，因为E中所表达是的大炮本身被prove helpful，所以应该用-ing分词，去掉BC两个有其他错误的选项后答案应为A

请教各位NN

nerakuhs

如果用ing则变成了 cannon一直在shooting， 意思就不对了

entheticism

正好和新闻里面的故事不谋而合。嘎嘎！
纽约机场英雄～