______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 本题考查定语从句。As在句中作关系代词,引导定语从句,意为“正如(……),(是……这样的)”,在句中作主语,故答案为[A]项。That和Which引导定语从句时不能置于句首,故均排除。What不能引导定语从句,且在引导名词性从句时不能置于句首,故也排除。
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