大全413, 补充-066 老题新问

413. 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
(E) to investigate what the effects changes in working conditions would have on workers’ performance

有人说A中that would  时态错误，应该用一般过去时？请问WOULD在这里是什么时态？

为什么A用WOULD时态错误，B用WOULD就时态正确？

怎么没人理我呀，好汉们到哪去拉？

楼上说的我懂，但还是和楼主有一样的疑问。

不理解的是would 和   would have 在句子中的成分，以及B的时态。

请牛牛解答。