He is no more a little boy.
=He is no longer a little boy.
=He is not a little boy any more.
=He is not a little boy any longer.
no more=no longer=not...any more=not...any longer不再
所以选B.
He is no more a little boy.
=He is no longer a little boy.
=He is not a little boy any more.
=He is not a little boy any longer.
no more=no longer=not...any more=not...any longer不再
所以选B.