— Shall we go and have a picnic at the weekend?

— ______. According to the weather forecast, there might be a cold front by then．

A．Why not

B．We can wait

C．No, let's not　

D．It depends

会计印章使用和保管需要坚持（）。

A.专人使用

B.专人负责

C.专人保管

D.专人存放