Bats are long-lived creatures,______a life-expectancy of around 20 years.

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问题 Bats are long-lived creatures,______a life-expectancy of around 20 years.

选项 A、some have
B、some having
C、some of which having
D、some of them have

答案B

解析蝙蝠是寿命很长的生物，有的大约有20年。本题考查独立主格结构。creatures后面是逗号，证明空格后或者用从句，或者用非谓语动词。C选项中which引导的定语从句缺乏谓语动词(having是非谓语动词)，故是错误答案。B选项则是在现在分词having前加上了逻辑主语，构成了独立主格结构。

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GCT工程硕士（英语）

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