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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 

A

解析试题分析:句意:我们都知道六千万多年前恐龙曾经在地球上生存。million、hundred等数词在表示具体的数值时,要用单数。millions of则表示数百万的意思。故选A。
考点: 考查数词的用法。

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