Bats are surprisingly long-lived creatures, some _____ a life span of around 20 years.
A．having B．hadC．haveD．to have
A

試題分析：考查獨立主格結(jié)構(gòu)。分析句式結(jié)構(gòu)可知，這是一個簡單句，中間用逗號分隔，所以后半句是對前半句的補充說明，some是邏輯主語。其后應(yīng)跟非謂語動詞形式，由于some與have之間是邏輯上是主謂關(guān)系，所以用現(xiàn)在分詞形式，構(gòu)成獨立主格結(jié)構(gòu)。句意：蝙蝠是令人吃慷的長壽動物，有些蝙蝠的生命周期達到大約20年。
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