We are short of clean safe drinking water which is found to be the in many third world

问题补充：

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

答案：

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。