试题要求：
Ancient Greeks saw it as a duty_____.
试题解析：
答案：F
解析：
题干的中心词是duty。由第四段最后一句“They believed that helping others was their brotherly duty.”可知，古希腊人认为帮助别人是自己的责任。选项F符合题意。故选F。
考点：概括段落大意和补全句子,2017.4
Ancient Greeks saw it as a duty_____.
题干的中心词是duty。由第四段最后一句“They believed that helping others was their brotherly duty.”可知，古希腊人认为帮助别人是自己的责任。选项F符合题意。故选F。