In the last few years thousands of films __________ all over the world.

A．have produced

B．have been produced

C．are producing

D．are being produced

基金管理人委托代销机构办理基金的销售应当签订( )，明确双方的权利和义务。

A．书面代销协议

B．书面委托协议

C．书面交易协定

D．书面合作协议