【焦急求教】prep2-15

shiwen66666

15.        (25243-!-item-!-188;#058&002297)  
In the mid-1920s the Hawthorne Works of the Western Electric Company was the scene of an intensive series of experiments that would investigate changes in working conditions as to their effects on workers' performance.  
(A) that would investigate changes in working conditions as to their effects on workers' performance  
(B) investigating the effects that changes in working conditions would have on workers' performance  
(C) for investigating what the effects on workers' performance are that changes in working conditions would cause  
(D) that investigated changes in working conditions' effects on workers' performance  

(E) to investigate what the effects changes in working conditions would have on workers' performance  

选B。

问：C中for是干什么用的？

aeoluseros

for investigating只能做attributive phrase了，无法做状语。

shiwen66666

for investigating只能做attributive phrase了，无法做状语。

-- by 会员 aeoluseros (2010/1/18 7:05:49)

怎么看是不是只能作定语呢？

另外，在什么情况下不会产生可能做定于或作状语得歧义呢？