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

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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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