Join A Table With Different Tables But With A Field In Common?

I have a table activity which show the activities of the site. An activity could be related with no other entity or it could be related with an account, or with a contact or with an opportunity. An opportunity and a contact could be also related with an account.

My problem is that I need to show the activity and the related account (if there is any) but because the relationship with an account could be done by different ways, I dont know how to do it without join the account table several times.

This is my current query:

SELECT AC.IdActividad, CU.idcuenta
FROM Actividades AC LEFT JOIN Tareas TA ON TA.IdActividad = C.IdActividad
LEFT JOIN ActividadesXCuenta AXC ON AC.IdActividad = AXC.IdActividad LEFT JOIN dbo.Cuentas CU ON axc.IdCuenta = CU.IdCuenta
LEFT JOIN dbo.ActividadesXOportunidad axo ON AC.IdActividad = axo.IdActividad LEFT JOIN dbo.Oportunidades o ON axo.IdOportunidad = o.IdOportunidad LEFT JOIN dbo.Cuentas CU1 ON o.IdCuenta = CU.IdCuenta
LEFT JOIN dbo.ActividadesXContacto axco ON AC.IdActividad = axco.IdActividad LEFT JOIN dbo.Contactos con ON axco.IdContacto = con.IdContacto LEFT JOIN dbo.Cuentas CU2 ON o.IdCuenta = CU.IdCuenta

As you see, I have the table Cuenta joined 3 times. That means that I need to put the ActivityID field 3 times but based on how the report was developed, I could not do that.