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  3. Bats are surprisingly long-lived creatures, some______a life span of around 20 years.

Bats are surprisingly long-lived creatures, some______a life span of around 20 years.

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问题 Bats are surprisingly long-lived creatures, some______a life span of around 20 years.
选项 A、having
B、had
C、have
D、to have
答案A
解析 分析句子结构，句中没有连词，故空处应填非谓语动词，构成独立主格结构。had和have是谓语动词形式，故排除。to have表将来；having表伴随。根据句意，本句为一般陈述语气，故选A。
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