在存续期内不偿还本金的融资工具是( )。

A．普通股票

B．债券

C．国库券

D．银行存款

When you come to the fence，you can see a notice________there saying “________the grass”．[ ]

A．putting up；Keep off  

B．putting up；Keep away

C．put up；Keep out  

D．put up；Keep off