拦网时，拦网队员的手可以伸过网，但有什么要求？
参考答案：
在对方击球前或击球时不得妨碍对方。
— Was it not until last week ______ he decided to give up smoking?
— No. He began _____ he saw the new film last month.
A．when; as soon as
B．that; directly
C．did; after
D．that; till
简述商业谈判在让步中应“尽可能运用有意而无损的让步”
