Question

We all know that dinosaurs lived on the Earth more than ______ years ago.

A．sixty million

B．millions of

C．sixty million of

D．million of

Answer 1

A

解析试题分析：句意：我们都知道恐龙在地球上生存在6千万年前。表示确切数字，million不用复数；表示概数，million必须用复数，并且和介词of连用，所以选A。
考点：考查数词。