题目选项分析

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.

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.