LINQ查询等同于SQL

Question

任何人都可以请我提供LINQ查询，相当于以下SQL查询

select * from C
 LEFT JOIN LEF on C.Id = LEF.CId
 LEFT JOIN LOF ON C.Id = LOF.CId
 JOIN CU on CU.Id = LOF.COId OR CU.Id  = LEF.COId
 JOIN PA ON CU.Id = PA.Id 
  WHERE PA.Id=1

我正面临着在linq查询中编写OR条件的挑战