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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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C，for doing不表示目的；that离先行词effects隔了effect的定语和谓语动词are，错误；
E，what多余，语言习惯是to investigate X 而不是 to investigate what X is。
to investigate the effect而不是 to investigate what the effect is
to investigate whether global warming will occur and what impact it will have, 这里因为要与whether平行，所以用what impacts最佳
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