There a number of natural mysteries in the world that even make scientists .
A. exists; confusing
B. are existed; confused
C. exist; confused
D. exist; confusing
网友回答
A. exists; confusing
B. are existed; confused
(答案→)C. exist; confused
D. exist; confusing
解析：考查固定句型和形容词辨析。There exist...表示“存在、有......”，排除B；exist的单复数要根据后面的名词来定。根据mysteries可知，应该用复数，即原形，排除A；confused“迷惑的”，修饰人；confusing“令人迷惑的”，修饰物。这里修饰的是scientists。故选C。