______ is often the case with a new idea,much preliminary activit_英语解答

______ is often the case with a new idea,much preliminary activity and optimistic discussion produced no concrete proposals.
[A] That [B] It [C] This [D] As
为什么选D?请翻译整句,

人气：245 ℃　时间：2020-04-05 09:22:01

解答

像每个新思想一样,很多预备工作和乐观的讨论没有产生具体的结果.
As is often the case 是 idiom.