Question

________ born in Chicago, the author is most famous for his stories about New York.

1. A.
   Although
2. B.
   Since
3. C.
   As
4. D.
   When

Answer 1

A
although引导让步状语从句，因从句的主语与主句主语一致，且谓语动词会有be，所以从句中的主语和be一起省略，Although (the author was) born in Chicago。