The human body consists of organs, each a definite job to do.
A. have
B. to have
C. has
D. having
网友回答
A. have
B. to have
C. has
(答案→)D. having
解析：考查独立主格结构。独立主格结构是由名词+其它成分构成，不是句子，但是作用相当于句子。本题两部分之间没有连词，说明后半部分不是句子，而是短语。排除AC。Each与have构成主动关系，故使用现在分词的形式。each having a definite job to do=and each has a definite job to do.故D 正确。