主语从句,句子主干为：it's been found that oils are bad.即：研究发现有些油对人们有害.
That后面是句子的实际主语,可以看出主语很长,从而用这种后置的结构是避免句子头重脚轻.
其他都是句子的次要成分.in laboratory testing意为“在实验室测验中”.
it's been found in laboratory testing that some types of oil
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