Sometimes we fail and sometimes we succeed.It is how you react that makes a in life.A. dev

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A. development
B. point
C. progress
(答案→)D. difference
解析：development “发展，开发”；point “点，要点”；progress “进步，进展” ；difference “不同，差别”。make a difference “起作用，有关系，影响”。句意：我们每个人都时而会失败，时而会成功。怎样对待这些才是生活中真正重要的事情。故选D项。