2. 外语
  3. _______ is often the case with a new idea, much preliminary activity and optimistic discussion produce no concrete proposals.

_______ is often the case with a new idea, much preliminary activity and optimistic discussion produce no concrete proposals.

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问题 _______ is often the case with a new idea, much preliminary activity and optimistic discussion produce no concrete proposals.
选项 A、As
B、That
C、Which
D、What
答案A
解析 As在这句话中作关系代词，在从句中做主语，来代替整个主句，其余选项无法构成正常的主从句结构。
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