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

試題分析：本題的含義是她直到她媽媽回家的時候才去睡覺，not……until表示直到……才……的意思，until引導的時間狀語從句是過去時，故主句也應該用過去時的一種，所以主句應該用過去時的否定結(jié)構(gòu)，故本題只能選A。
點評：本題用until引導時間狀語從句，在英文中也可以用after或before進行轉(zhuǎn)換。
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