______was pointed above, this substance can be used as a substitute.A、ItB、That

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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

解析本题测试状语从句。as引导方式状语从句，也可以看做是插入语。本句的意思是：“正如上面所指出的，这种物质可用做替代品。”

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