求助英语问题

___is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals. bC)diC  
A that, B it, C this, D as %j{gZ
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;r"YZs&Xd  
which one is the answer? thanks!

d吧

我感觉C正确

Ｄ，是正确答案

D，感觉是

D AS

确定 D

选B，it是形式主语，真正的主语部分是后半句。

___is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals. eG&3E`[  
D=>[~u3H  
A. 对于一个新的想法，实际情况是大多数预备活动和乐观的讨论不会得出明确的建议。 V DN@=/  
()\=(n!J  
)0\"8}!  
%k+G-oT5  

应该是AS