又一英语选择题._______years ago,coal was from trees and other plant

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又一英语选择题.
_______years ago,coal was from trees and other plants that grew on the earth
a. twenty millions of b some millions of(答案选的是这个,但我觉得一点都不合理)
c.million of d.twenty millions

1、million这个词,用法同thousand等
具体数字+thousand/hundred/million/billion +名词（表示的是具体的数字）
如：Two million years ago(两百万年以前）
thousands/hundreds/millions/billions +of+名词（表示不确定的泛指数,不仅要用复数,而且后要跟of才能接名词）
这样,A和D是不对的,C的话,应该是millions of
2、翻译为：
hundreds of 数百的,成百上千的
thousands of 数千的,成千上万的
millions of 数以百万的
billions of 数十亿的
再问：那就是说这里没有一个答案是对的咯？
再答： some millions of 是对的啊，真晕了让你，呵呵，我说的第二种形式，后面加s的这种，前面可以有修饰词。

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