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She   until his mother got back home.That’s why she was so tired.
A.didn’t sleepB.doesn’t sleepC.sleptD.sleeped
A

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。
点评:本题用until引导时间状语从句,在英文中也可以用after或before进行转换。
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