问题补充：
单选题_______thosepastyears,wecouldn’thelpfeelingsorryforourparentswhoneverhadarestalltheyearround.A.Looking back uponB.Looking aroundC.Looking outD.Looking up
答案：
A解析 词义辨析。Looking back upon回顾；Looking around向四周看；Looking out向外看；Looking up抬头看。句意：回顾过去的这些年，我们对常年不休息的的父母感到抱歉。所以选A。
