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

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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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