How to implement left join on lambda linq expressi

问题:

I've a FilterAsync method to do the query with where clause and includes the navigation properties. Below is the method for the FilterAsync.

  public async Task<IQueryable<T>> FilterAsync<T>(Expression<Func<T, bool>> predicate, params Expression<Func<T, object>>[] includes) where T : class
        {
            return await Task.Run(() =>
            {
                //Return first 250 records/objects from 
                var query = _context.Set<T>().Where(predicate).AsQueryable().Take(250);                
                return includes.Aggregate(query, (current, includeProperty)
                               => current.Include(includeProperty).AsQueryable());               
            });
        }

My Actual query that calls the filterasync method to get the required data is below.It has conditions for the where clause and the navigational properties as included.

 model = await _repo.FilterAsync<SchoolContractServiceAreas>
                    (psa => psa.SchoolId == SchoolId &&
                    psa.SchoolContract.StartDate < DateTime.Now &&
                    psa.SchoolContract.EndDate > DateTime.Now,
                    pc=> pc.SchoolContract ,
                    p=> p.SchoolContract.School);

Now, the Question is - When I see the query that is being transformed in to SQL in SQL Profiler is, It is doing inner join with the SchoolContract and SchoolContractPartner. But, I want to do Right join on p=> p.SchoolContract.School. How can I implment a right join on this? Thanks for the help in advance.