If I had been to the party last week ,I ___sorry for it now.

If I had been to the party last week ,I ___sorry for it now.
A.would not be feeling B.wouldn`t have left
C.mustn`t feel D.should have feel
这道题我倒是明白是对过去事实的相反,但不明白的是would not be 后要进行时 A
Nancy sometimes wishes that she ___ in a small town .
A.is not living B.was not living
C.were not living D.did not live
这是关于wish的虚拟语气,但从什么地方看出是对将来事实相反?难道是sometimes?还有我发现,句子中带有sometimes的关于wish的虚拟语气都是对于将来事实的相反,
补充一点：第二题的答案是C。（第三个高说：Nancy有时希望自己不是住在一个小镇上
本来是she is not living in a small town 但这是Nancy的愿望，与她现在的实际情况相反 ）
我不明白的是关键是为什么是is not living 这个进行时，而不是其他时态。