___ 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

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(fù)數(shù)形式；不確切數(shù)量常用hundreds/thousands/millions/billions + of+名詞的復(fù)數(shù)形式.根據(jù)語(yǔ)境可知選擇B。
點(diǎn)評(píng)：區(qū)分確切數(shù)量和不確切數(shù)量的表達(dá)方式，有幾個(gè)關(guān)鍵點(diǎn)要分清楚。確切數(shù)量必須要有基數(shù)詞,且量詞不能用復(fù)數(shù)形式；不確切數(shù)量的量詞必須要有復(fù)數(shù)形式，且其后一定要加介詞of。只要掌握好這兩點(diǎn),確切數(shù)量和不確切數(shù)量的問(wèn)題基本解決。
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