Much preliminary activity and optimistic discussion produced no concrete proposa

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问题 Much preliminary activity and optimistic discussion produced no concrete proposals, ______is often the case with a new idea.

选项 A、that
B、this
C、it
D、as

答案 D

解析此题的测试点是关系代词as的用法。as引导一个非限定性定语从句，其先行词是前面整个句子。另外，考生还可以把as is／was the case with…作为一个固定句型来记。

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Itisdifficulttoguesswhathis______totheproposalwillbe.A、commentB、impre