He didn't go to sleep ______he finished his homework.C. aHe didn't go to sleep ______he finished his homework. A. till B. before C. after D. until 选什么,为什么,有什么区别?
问题描述：
He didn't go to sleep ______he finished his homework.C. a
He didn't go to sleep ______he finished his homework.
A. till B. before C. after D. until 选什么,为什么,有什么区别?
答
D
这里考的是
not.until...句型,意为：“直到.时候才.”
他直到作业做完才睡觉