I don’t believe we’ve met before I must say you do look familiar.A. therefore B. althou

问题补充：

I don’t believe we’ve met before, I must say you do look familiar.

A. therefore

B. although

C. since

D. unless

答案：

A. therefore

(答案→)B. although

C. since

D. unless

解析：词义辨析。A因此；B尽管；C既然，自从；D除非，如果…不…；句意：尽管我说你看起来很熟悉，但是我认为我们以前没有见过。故B正确。