  We study double spin asymmetries in Drell-Yan processes in which one initial
hadron is transversely polarized and another one is longitudinally polarized.
The complete part of the hadronic tensor relevant to asymmetries is derived.
This part consists of twist-2 and twist-3 parton distributions and is gauge
invariant. We construct some observables which can be used to extract these
parton distributions from experimental measurements.
