[問題] SC#大全56

[chenemily (天天保持好心情)]

55. 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
demonstrationP 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


正解E

想請問A哪裡有錯

helpful in doning 是片語

除了片語判題 這題還有其他的解法嗎

謝

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