I ______ go to bed until I ______ finished my work.

题目

I ______ go to bed until I ______ finished my work.
A.don't; had
B.didn't; have
C.didn't; had
D.don't; have

答案

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.