单选题 The human body is composed of organs, each ______ a definite job to do.
A. has B. having C. to have D. had

【正确答案】 B
【答案解析】[解析] each having a definite job to do“每一个都有自己明确的分工”。这个分词独立结构放在主句之后，进一步补充细节情况。