______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.(北京大学2008年试题)

选项 A、That
B、It
C、This
D、As

答案 D

解析在这个句子中，as的意思是：正如……一样。在这里，关系代词as代表后面的“much preliminary activity and optimistic discussion produced no concrete proposals”，所以，答案是D。

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