An epigram is usually defined ___ a bright or witty thought that is briefly and ingeniously expresse

An epigram is usually defined ___ a bright or witty thought that is briefly and ingeniously expressed.
A：as
B：as be
C：as been
D：to being
A
本题考查介词。define sth. as sth.意为“给……定义为……”，题目意为“警句通常被定义为一种聪明或机智的思想，它被简短而巧妙地表达出来。”选项B,C,D均不符合语法，故错误。故选A。
综合知识     ingeniously     briefly     defined     usually     thought