单项选择题
A.must B.mustn‘t C.have to D.don‘t have to
Not until most of the people had left the airport（）his ...
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
Not always（）they want (to)A.people can do whatB.can peo...
单项选择题Not always（）they want (to)
A.people can do what B.can people do what C.people can not do what D.can‘t people do what
--We want to sit at the table near the window. -- I‘m s...
单项选择题--We want to sit at the table near the window. -- I‘m sorry, but（）already.
A.it took B.it takes C.it is being taken D.it has been taken
