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大全55

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楼主
发表于 2006-3-12 21:54:00 | 只看该作者

大全55

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 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 为什么用完成时呢????????谢谢!
沙发
发表于 2006-3-26 11:47:00 | 只看该作者

UP


我认为区分点不应在这两个时态上。


不过还是弄清楚比较好。


[此贴子已经被作者于2006-3-26 11:49:04编辑过]
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