Family members worked hard ______ sure that they had enough food.

　　A. making B. make C. made D. to make

　　答案：【D】

　　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.....”，故选D。

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