Question

---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

Answer 1

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。