问题补充：
单选题DuringhisfirsttriptoChina,PresidentObamadiscussedsomekeyglobalissuessuchaseconomicrecovery,climatechange,_______nuclearweaponsinhistalkswithChinesePresidentHuJintao.A.and stopping to spreadB.to stop spreadingC.to stop to spreadD.and stopping the spread of
答案：
D
