如何在EF到LINQ中使用左连接？

Question

我有这个带有左联接的SQL Server查询-如何在EF到LINQ中使用它？

select 
    R.region_id, R.region_name, count(AR.Id) as Agency 
from 
    region R 
left join 
    governorate G on r.region_id = g.region_id
left join 
    AgencyReports AR on g.governorate_id = AR.governorate_id
group by 
    R.region_id, R.region_name

我需要将其转换为EF到LINQ查询。