--- Can you please tell me something about life in the future?

---Oh, maybe in the future, people will _______ by robots.

A．cared for

B．be taken good care

C．be cared for

D．look after

已知关系R见下表，可以作为R主码的属性组是()。[*]

A．ABC

B．ABD

C．ACD

D．BCD