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题库 / Prep2007E2-SC-15
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.
that would investigate changes in working conditions as to their effects on workers' performance
investigating the effects that changes in working conditions would have on workers' performance
for investigating what the effects on workers' performance are that changes in working conditions would cause
that investigated changes in working conditions' effects on workers' performance
to investigate what the effects changes in working conditions would have on workers' performance
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what自己是名词，身后是定语从句。changes in working conditions would have on workers' performance又是effect的定语从句，所以what身后的定语从句就少了谓语动词。
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