求助大全～～～987---413谢谢～～～

1.      
In the mid-1920’s 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 are the effects in workers’ performance that changes in working conditions
would cause

(D) that
investigated changes in working conditions’ effects on workers’ performance（B）

(E) to investigate
what the effects changes in working conditions would have 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 are the effects in workers’ performance that changes in working conditions would cause

(D) that investigated changes in working conditions’ effects on workers’ performance（B）

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

A。their指代不清，前面有多个复数名词，changes，conditions

C。根据题目意思，effects指的是changes on performance。而不是说what are the effects。题意改变。for doing作动作目的不好，一般用to do

D。改变意思，重点不是changes，而是effects。

E。没有B清楚。what引导名词性从句，比较罗唆（与B相比）