C过去的事。直到我已经完成了我的工作我才睡觉。A. B 时态不一致D时态也不对，因为这件事要么就发生了，要么就没发生(将来）I won't go to bed until I have finished my work.也是可以的。
D . I ( don't ) go to bed until I (have ) finished my work.
C
