听力原文： Fighting flared yesterday in northern and southern Bosnia, pitting Serbs against Muslims and Muslims against Croats.(27[C]) Meanwhile, Bosnian Serbs voted on a peace plan they seem certain to reject. The defiance of Bosnian Serbs and the three-way fighting underlined the complexity of bringing peace to this ragged state. A brutal 13-month war had destroyed its elaborate ethnic quiet, stitched together by centuries of coexistence.
(28[A]) The United States President had dismissed this weekend's Bosnian Serb referendum as a maneuver to buy time. He is expected to press reluctant Europeans for military action against Bosnia's Serbs if they do reject the apparently doomed Vance Owen plan.
Tangled fighting between the three races broke out ______.
A．before Serbs voted on a peace plan
B．after Serbs voted on a peace plan
C．just as Serbs voted on a peace plan
D．as soon as Serbs voted on a peace plan