题目

下列措施中，对地方割据势力未能起到限制作用的是 A．秦始皇推行郡县制                       B．汉武帝颁布“推恩令” C．唐朝设置节度使                         D．宋太祖派文臣任知州 答案：C The soldiers were extremely tired and the heavy rain ________ their difficulty． [　　] A．to add B．added up C．added to D．added up to