_____ is often the case with a new idea, much preliminary activity and optimisti

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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

解析考查as作为关系代词的用法。此句中，as引导非限制性定语从句，指代整个主句，as意为“正如……一样”，其他三项均不能引导非限制性定语从句，所以选D。

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