i hear that his father( )since 10 years ago.a.has died b.died c.was dead d.has been dead

i hear that his father( )since 10 years ago.a.has died b.died c.was dead d.has been dead
i hear that his father( )since 10 years ago.a.has died b.died c.was dead d.has been dead

i hear that his father( )since 10 years ago.a.has died b.died c.was dead d.has been dead
d,dead是形容词,不表动词,死是瞬间动词

d

d has been dead