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____ has been found out ____ oil food is bad for our health

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____ has been found out ____ oil food is bad for our health
A That ,that B That ,what C It ,what D It ,that CD怎么区别
____ has been found out ____ oil food is bad for our health
答案是D.It 在这里做形式主语,而that 引导一个真正的主语从句.又如:
It is said that our teacher will get married next week.
而C 只能这样用:
It has been found out that what he likes is money.