much as 虽然,尽管：Much as she likes him,she would never consider marrying him.尽管她喜欢他,但她并不打算嫁给他
much so：没这个短语.
as much 同样地：I would do as much for you.我同样为你这样做.
so much 如此多：We make a charge of so much per day.我们每天收费这么多.
因此,答案选A.
“因为我有一个非常重要的会议要参加,所以今晚我不能来看你.尽管如此,我还是愿意来看你”