题目：
Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.
A. having
B. had
C. have
D. to have
答案：
参考答案：A
解析： 分析句子结构可知，该句为独立主格结构。some为逻辑主语并与谓语动词构成主动关系，故A项正确。
Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.
A. having
B. had
C. have
D. to have
参考答案：A
解析： 分析句子结构可知，该句为独立主格结构。some为逻辑主语并与谓语动词构成主动关系，故A项正确。
