With all the food supply , the researchers had to put an end to the wildlife protection project and returned home.
A. running out
B. to use up
C. run out of
D. using up
网友回答
(答案→)A. running out
B. to use up
C. run out of
D. using up
解析：考查with的复合结构，with +宾语+现在分词，表示主动进行，句意：随着所有的食物供应快要用完了，研究人员不得不结束野生动物保护工程回家。run out用完，所以选A。