--Excuse me, you are supposed to hand in your design now.

--I’m sorry, my computer broke down, or I ________ it last night.

A．finished

B．would finish

C．had finished

D．would have finished

产品质量认证又分为（）。

A．质量管理体系认证

B．长城认证

C．安全认证

D．合格认证

E．PRC标志认证