问题
单项选择题
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。
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