157. In the mod-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

答案是B，我选择E

findjuhl的解释为

A: their没有指代

B: correct

C: that没有指代

D: conditions’ effects 改变原意

E: changes in working conditions would have做定语修饰the effects，what the effects没有谓语。

但是理解成what the effects(同位语changes in working conditions)would have，则E正确

3X

那E还是没有谓语的啊：）

E不需要谓语啊

 what the effects changes in working conditions would have on workers’ performance 做investigate的宾语