It is a truth universally acknowledged, that a single man in possession of a good fortune must be in want of a wife.

不是单个过去分词不可以后置吗？

I dare say Mr. Bingley will be very glad to see you; and I will send a few lines by you to assure him of my hearty consent to his marrying which ever he chuses of the girls.

如何理解这里的consent to his marrying和chuses of。

marrying现在分词可以做先行词吗？chuses of是choose？