第20题: [单项选择]Joe had many regrets when he ______ the years he spent abroad. A. looked back on B. looked down upon C. looked up to D. looked out of 参考答案:A 答案解析:[解析] 本题考查对固定动词词组的掌握,选项A中的look back on(回忆,回想起)与题意相符,故为正确答案。 [避错指南] 考生要注意平时的积累,清楚区分各词组的意思。选项B(look