Question

There are ________ books in the National Library.

A．twenty millions	B．twenty millions of
C．twenty million	D．twenty million of

Answer 1

C

解析试题分析：句意：在国家图书馆里有2千万本书。million 百万，跟数词连用时不用复数形式；或者用于短语millions of，成百万的。故选C。
考点：考查数词。