----Have all the students known that our class will visit the factory this afternoon?

----Yes. Every student______about it.

A．told

B．has told

C．was told

D．tells

资本积累的实质是( )。

A．用榨取的剩余价值来榨取更多的剩余价值
B．增加社会财富总量
C．扩大生产规模，增强竞争能力
D．推动社会进步