For European settings, stuff like the Blenheim, Wellington, Cant Z 1007 or He-111 come to midn as a pretty generic bombers.
In the Pacific/CBI theaters, you have things like B-25C/D's, G4M's, Ki-27's and B-17E/B-24D's.
The Boston/A-20 was around at this time, but was relatively little-used until later in the war.
J_A_B