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Family members worked hard _____ sure that they had enough food.
A、making
B、make
C、made
D、to make
【正确答案】：D
【题目解析】：本题考查非谓语动词。句意：家人努力工作以确保拥有足够的食物。此处为动词不定式作目的状语，表示“为了……”。故选D。