Every individual in a continually changing world of experience of which he or she is the center.
A. exists
B. will exist
C. is existing
D. has existed
网友回答
(答案→)A. exists
B. will exist
C. is existing
D. has existed
解析：本题考查时态。根据句意：每一个人都存在于一个以自我为中心、阅历不断变化的世界里。可知用一般现在时，选A。