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【题目】—How many years has life been on earth?

—______ years, I think.

A. 5 millions B. 5 millions of

C. Million of D. Millions of

【答案】D

【解析】

试题分析:句意:--地球上有生命已经有多少年了?--几百万年了。 Million 百万,七用法是:和数词连用,表示确定的数量,后不加s,也不加of;Millions of固定用法,表示百万……,必须加s。根据题意,故选D。

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