听力原文： Fighting flared yesterday in northern and southern Bosnia, pitting Serbs against

Muslims and Muslims against Croats. 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 rugged state. A brutal 13-month war had destroyed its elaborate ethnic quiet, stitched together by centuries of co-existence.

The United States President Bill Clinton had dismissed this weekend's Bosnian Serb referendum as a maneuver to buy time. He is expected to press reluctant European8 for military action against Bosnia's Serbs if they do reject the apparently doomed Vance-Owen plan.

Russian Foreign Minster Andrei Kozyev said after talks with international mediators yesterday that the Vance-Owen plan should be implemented regard less of the outcome of a referendum in Bosnia. The Vance-Owen plan would divide Bosnia-Herzegovina into 10 largely autonomous provinces. Muslims, Serbs and Croats would each dominate in three provinces, with the tenth, Sarajevo, jointly governed.

Tangled fighting between the three races broke out ______ Serbs voted on a peace plan.

A．before

B．after

C．as

D．as soon as