问题标题：
【Mr．HerpinisoneoftheforeignexpertswhoisworkinginChina．___．】
问题描述：
Mr．Herpin is one of the foreign experts who is working in China．___．
李宝瑞回答：
is--are考查主谓一致．定语从句who is working in China其中关系代词who指代的是名词experts，所以谓语动词应该用复数形式．
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