I met Jane while I ______ in the street last Monday. We ______ each other for three years. [ ]

A. worked, didn't see

B. worked, don't see

C. was walking, haven't seen

D. was walking, hadn't seen

数据库技术的根本目标是要解决数据的( )。

A．存储问题

B．共享问题

C．安全问题

D．保护问题