I should very much like to go to the party, but ---.

B

but 一般引出一个客观事实, 用陈述语气
这里 i have not been invited 说的就是现在的一个事实, 即“没被邀请”, 陈述一个客观事实不用虚拟语气


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再问： 书上说but后用虚拟语气，什么时候but用虚拟语气啊
再答： 绝对看错了！！ 如： I would have given it to him, if I had seen him(虚拟语气） yesterday =I would have given it to him, but I didn't see(（陈述语气） him yesterday.