( )was pointed above, this substance can be used as a substitute.A、ItB、ThatC、W

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问题 ( )was pointed above, this substance can be used as a substitute.

选项 A、It
B、That
C、What
D、As

答案 D

解析本题考查定语从句。本题由as引导定语从句，指代后面的整个句子，在从句中担当主语成分。

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