Linq to SQL: how to aggregate without a group by?

I am searching for the Linq-to-SQL equivalent to this query:

SELECT
  [cnt]=COUNT(*),
  [colB]=SUM(colB),
  [colC]=SUM(colC),
  [colD]=SUM(colD)
FROM myTable

This is an aggregate without a group by. I can't seem to find any way to do this, short of issuing four separate queries (one Count and three Sum). Any ideas?