英语语法疑惑

It was suggested that we_____ the meeting by next Monday.
A, hold B, would hold C, held D, be held
此时that后面是不是用虚拟语气？
suggest此时是不是不是建议？
it又是指什么？
求高手分析解释 谢谢
答：A
译：（当时）有人建议我们（应该）下周一开这个会议。
析：本题考虚拟语气（10）动词。insist, suggest, order, demand等等动词的宾语从句，其谓语动词用should+V. should经常省略。
将它们变成被动语态，坚持，建议的内容变成了主语从句，it was suggestied that .. 也是这样。
It是形式主语，that-从句才是真正的主语。
这些词的名词的同位语从句，表语从句也一样
the suggestion that...
My suggestion is that....

suggest 此处是 建议；
that 后面是虚拟语气 正确答案为：A
it是代表后面that 引导的主语从句。

It was suggested that we__a___ the meeting by next Monday
suggest 解释为建议时，为虚拟语气。suggest that sb（should）do
suggest 解释为暗示时，无此用法。
it 为形式主语，指代that we__a___ the meeting by next Monday
注：其他表示提议的词也有类似用法。比如说advise等