I don't believe we have met before,.I must say do look familiar.为啥用although不用therefore

问题描述:

I don't believe we have met before,.I must say do look familiar.为啥用although不用therefore

因为前半句与后半句明显是转折关系,所以用转折连词.

我不相信我们过去曾经遇到过,尽管我必须说我们看起来很熟悉.
although= 尽管
therefore= 因此