We are short of clean safe drinking water, which is found to be the in many third world countries.
A. example
B. event
C. case
D. object
网友回答
A. example
B. event
(答案→)C. case
D. object
解析：考查名词辨析：A. example例子，B. event事件C. case 情况，案例D. object物体，句意是：我们缺少干净的饮用水，这被发现是很多第三世界的国家都有的情况。选C。