His family has decided to tell him about the death of his wife.

His family has decided to tell him about the death of his wife. He is（ ）find out about it sooner or later.

bound to

bound for

bound in

bound up

本题考查bound的介词，要用be bound to：一定，选A。句意：他的家人决定告诉他妻子的死讯。他迟早（一定）会发现的。