ACCorDing to thE pAssAgE, john ColtrAnE DiD All oF thE Following During his CArEEr ExCEpt ______.
A．improvisE on mEloDiEs From A numBEr oF DiFFErEnt CulturEs
B．spEnD timE improving his tEChniCAl skills
C．ExpErimEnt with thE sounDs oF vArious instrumEnts
D．EliminAtE thE inFluEnCE oF BEBop on his own musiC