—All the villagers _____the fight against the big flood, _____young and old, men and women.

— It’s really very brave of them to do so.

A．joined; including

B．joined in; included

C．joined in; including

D．joined; included

候选键的属性可以有（）

A.0个 

B.1个 

C.1个或多个 

D.多个