【多选题】(video 1) “It began with the forging of the great rings. Three were given to the elves, immortal, wisest, and fairest of all beings. ” Passive voice is used in the previous sentence because___.
A.
the agent is unknown
B.
the agent is self-evident
C.
the agent is not the focus of attention
D.
the agent is known but the speakers/writers prefer to be vague about who is responsible