thE pAssAgE impliEs thAt kissingEr's mEssAgE "EurEkA" wAs sEnt ______ .
A．whEn thE nEgotiAtion stArtED in BEijing
B．As soon As hE ArrivED in wAshington
C．whEn hE FlEw to viEtnAm on july 11
D．whEn thE nEgotiAtion wAs ComplEtED in BEijing