题目选项分析

Standing twelve feet tall, weighing nine thousand pounds, it wielded seven-inch claws, and the giant ground sloth Megatherium americanummay have been the largest hunting mammal ever to walk the Earth.

Standing twelve feet tall, weighing nine thousand pounds, and wielding seven-inch claws, Megatherium americanum, a giant ground sloth,may have been the largest hunting mammal ever to walk the Earth.