Bats are surprisingly long-lived creatures, some a life span of around 20 years.
A. had
B. having
C. have
D. to have
网友回答
A. had
(答案→)B. having
C. have
D. to have
解析：考查非谓语动词。句子的主句是“Bats are surprisingly long-lived creatures”，逗号后面是非谓语部分，some是逻辑主语，指的是“一些老鼠”，如果选C的话，两个并列分句需要and连接，some和have是主谓关系，用现在分词，故选B。