问题
选择题
---Shall I tell your best friends what happened to you yesterday?
— they ask you.
A.Not if
B.Not unless
C.Not except
D.Not though
答案
B
考查连词。If 如果;unless 除非;except除了;though尽管。句意:我要告诉你最好的朋友你昨天发生了什么事吗?——不,除非他们问你。故选B。