问题
选择题
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
答案
答案：A
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。