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_____was pointed above,this substance can be used as a subst

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_____was pointed above,this substance can be used as a substitute.A it B that C what D as
为什么选D呢?其他三个为什么不对?也可以说是“上面说的是、、、、”,而不是一定要用“正如”啊,为什么?了
D as 表示正如,正像,引导的是一个非限制性定语从句.
it可以做形式主语,但应该是It was pointed above that ……
what 可以引导主语从句what was pointed above was that ……