___ years ago, the population of China was over 20 million.

A．Four hundreds
B．Four hundred
C．Four hundred of
D．Four hundreds of

B

解析試題分析：此題考查名詞的量。確切數(shù)量常用數(shù)詞+hundred/thousand/million/
billion+名詞的復數(shù)形式；不確切數(shù)量常用hundreds/thousands/millions/billions + of+名詞的復數(shù)形式.根據(jù)語境可知選擇B。
考點：確切數(shù)量和不確切數(shù)量
點評：區(qū)分確切數(shù)量和不確切數(shù)量的表達方式，有幾個關鍵點要分清楚。確切數(shù)量必須要有基數(shù)詞,且量詞不能用復數(shù)形式；不確切數(shù)量的量詞必須要有復數(shù)形式，且其后一定要加介詞of。只要掌握好這兩點,確切數(shù)量和不確切數(shù)量的問題基本解決。

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