单项选择题
Not until his father came back,（）to bed.
A．did the boy go B．went the boy C．the boy goes D．the boy did go
单项选择题 My sister has been working in that factory ever（）it was set up.
单项选择题 Hurry up! Otherwise the play（）by the time we got there.
单项选择题 （）in Hangzhou for more than ten years, he knew the city quite well.>
