Our food supply . We'd better get some in case there's none left.
A. is running out
B. has run out of
C. is using up
D. has used up
网友回答
(答案→)A. is running out
B. has run out of
C. is using up
D. has used up
解析：
试题分析: 句意：我们的食物供应快要没了。咱们最好去买些来以防什么也没有了。根据后句内容可知食物是快吃完了，排除BD选项；而use up 是及物动词短语，run out 是不及物动词短语，主语可以是物，故答案选A。