She until his mother got back home.That’...

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

A.didn’t sleep B.doesn’t sleep C.slept D.sleeped

A 【解析】试题分析：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。考点：过去时的使用和not……until结构的使用。

考点分析：

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