______she joined the company only a year ago, she’s already been promoted twice.

选择一项：
a. Although 解析：【译文】虽然她一年前才进公司，但已晋升两次了。本题考查状语从句。although引导让步状语从句；because引导原因状语从句；if引导条件状语从句；when引导时间状语从句。根据题意，应选A。
b. Because
c. If
d. When