______ is often the case with a new idea, much preliminary activity and optimist

游客2023-11-20 24

问题 ______ is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals.

选项 A、That
B、It
C、This
D、As

答案 D

解析分析句子结构，空白处应是连词，所以首先排除B和C。但that不能引导非限制性定语从句，所以答案是D。

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