______ is often the case with a new idea, much initial activity and optimistic d

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问题 ______ is often the case with a new idea, much initial activity and optimistic discussion produce no concrete proposal.

选项 A、It
B、Which
C、As
D、That

答案 C

解析本题测试as引导非限定性定语从句的用法。as作为连词，代替后面整个句子，意为“正像，正如”。

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______isoftenthecasewithanewidea,muchinitialactivityandoptimisticd