the time of the dinosaurs，an unusual creature called Whatche...

            the time of the dinosaurs，an unusual creature called Whatcheeria was a top predator,which lived around 330 million years ago during a time known as the Carboniferous period.（ ）

本题句意为“早在恐龙时代之前，一种名为Whatcheeria的不同寻常的生物就已经是顶级捕食者，它生活在大约3.3亿年前的石炭纪。” Long before：很久以前，表示在某个特定时间点以前的一个时期； after long不经常作为固定短语出现；before long：不久之后；long after：很久之后。根据句意及用法，选A。