单项选择题
My sister has been working in that factory ever（）it was set up.
A．since B．while C．when D．fill
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.>
单项选择题 Jenny is learning Japanese.（）her brother.
