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

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

选项 A、Which
B、So
C、It
D、This
E、As

答案E

解析 as在句子当中引导定语从句,as本身指代主句的内容,并且在从句中充当主语。A选项中的which也能引导定语从句,但是不能置于句首。其他三个选项不能引导定语从句。故选E。
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