求助英語問題

___is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals. +u)$o  
A that, B it, C this, D as YCdxU1V  
Um|Tf]q  
which one is the answer? thanks!

d吧

我感覺C正確

Ｄ，是正確答案

D，感覺是

D AS

確定 D

選B，it是形式主語，真正的主語部分是后半句。

___is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals. &5B+8>  
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