求教全部全真题987 #55

raceddeath · 发表于 2010-8-17 07:26:42

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
那么A为什么不对呢？
怎么分辨(E) a cannon that shoots.... in demonstrating 跟 (A) a cannon shooting.... to demonstrate
这两个有何区别？有影响到句中的含义么？

恳请各位大牛帮忙指点QQ

loverwy · 发表于 2010-8-17 17:14:06

doing强调反复动作，that从句强调特定一次性动作，如果用cannon shooting dead chickens就表示大炮反复把死鸡射向飞机

chenwei55143 · 发表于 2010-8-17 23:10:14

"helpful to demonstrate" and "helpful in demonstrating" both r correct. imo "to" means about sth hasnt happened, the aim while "in doing" means sth happened.

eg: u need a license to fly. vs flying is not as joyful as we expected.

so, E

小sai爱mj · 发表于 2011-3-26 21:14:55

还是不怎麽清晰。。

清绿地 · 发表于 2011-8-9 23:37:51

I don't think the focus is "to demonstrate" vs "in demonstrating"

D) is present tense
E) is present perfect

Based on the context, the present perfect makes more sense here.

The shooting of chickens does not proves itself helpful. It has proved helpful.

清绿地 · 发表于 2011-8-9 23:39:22

Cannon shooting dead chickens sounds as if cannon do shoot dead chickens normally

Cannons that shoot dead chickens sounds as cannons that are made to shoot dead chickens.

小sai爱mj · 发表于 2012-7-28 18:31:45

一年之后又被这道题绊住。。求解答。。

anonymous1111 · 发表于 2015-4-5 16:25:33

UP~~~~ that定从和 doing 分词有何具体区别

求教全部全真题987 #55

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