单选题 ______ she joined the company only a year ago, she's already been promoted twice.
A. Although B. Because
C. If D. When

【正确答案】 A

【答案解析】[解析] 本题考查连词用法。although“虽然，尽管”常引导让步状语从句；because常引导原因状语从句；if“假如，如果”常引导条件状语从句；when引导时间状语从句。根据句意，只有选项A符合题意。