(3rd LD) Bank of Korea holds key rate amid uncertainty

(ATTN: UPDATES with remarks from BOK governor Lee Ju-yeol in paras 4-6, 9-12, minor changes throughout; TRIMS) By Byun Duk-kun and Oh Seok-min SEOUL, Dec. 10 (Yonhap) -- South Korea's central bank kept its benchmark interest rate steady Thursday for