改错 In short,all has been improving since the scho
问题描述：
改错 In short,all has been improving since the scho
ol had began to carry on new policies!
答
更正如下：In short,all has been improving since the school began to carry out new policies!since引导的时间状语从句用一般过去时,主句则用现在完成时或现在完成进行时.carry on sth 继续某事；carry out sth ...怎么看出来是时间状语从句根据你的句意啊：简而言之，自从学校开始施行新政策以来，一切都在改善之中。