Beacuse I have a very important meeting to attend,I can not come to see you this evening

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”

A：much as ：非常像；和——几乎一样
B:much so：这是个错误词组
C:as much：同样多的
D:so much：那么多；全是
因为我有一个非常重要的会议要参加，今天晚上我不能来看你，我多么想（你）
选D