单项选择题
Not until most of the people had left the airport（）his sister was there.
A.that he saw B.had he seen C.did he see D.that he had seen
单项选择题 Not always（）they want (to)
单项选择题 --We want to sit at the table near the window. -- I‘m sorry, but（）already.
单项选择题 The boy（）to school already.
