Sheuntil his mother got back home.That’s why she was so tired.A. didn’t sleepB. doesn’t sl

问题补充：

Sheuntil his mother got back home.That’s why she was so tired.

A. didn’t sleep

B. doesn’t sleep

C. slept

D. sleeped

答案：

(答案→)A. didn’t sleep

B. doesn’t sleep

C. slept

D. sleeped

解析：本题的含义是她直到她妈妈回家的时候才去睡觉，not……until表示直到……才……的意思，until引导的时间状语从句是过去时，故主句也应该用过去时的一种，所以主句应该用过去时的否定结构，故本题只能选A。