A . A、((JohnMayer)wnAU)and((electroniccommercE.wnTI)B . B、((JohnMayer)wnAU)and((electroniccommercE.wnAB.C . C、((JohnMayer)wnAF.and((electroniccommercE.wnTI)D . D、((JohnMayer)wnAF.and((electroniccommercE.wnAB.
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