由介词或介词短语表示的虚拟条件句,是不是介词或介词短语后的就是从句?介词或介词短语前有逗号和没逗号时用法是否相同?还有2道题不明白请帮忙解释下为什么这么用...
1.I would love __B__to the cinema last night but I had to work extra hours to finish my work.
A.to go B.to have gone
C going D.having gone
2.Did you attend his birthday party last night?
No,I___A___,but I was very busy then.
A.would have B.did not
C.would attend D.had attended

1.I would love __B__to the cinema last night but I had to work extra hours to finish my work.
A.to go B.to have gone
C going D.having gone

would love to have done sth 原想要做某事；实际上没有作
指的是 过去的情况
2.Did you attend his birthday party last night?
No,I___A___,but I was very busy then.
A.would have B.did not
C.would attend D.had attended
同上一道一样。 也是指的是过去 实际上也没有做。
相当于原本要参加， 但是。。。
would have attended 很明显这2道题都是虚拟语气

关于你的问题介词和介词短语 后面所接的都不是句子，都是名词短语 ， 用的是虚拟语气

来看一个例子
but for your help, i wouldn't have passed the exam.

参考文献：个人观点