Many _______ of years later, the first e...

Many _______ of years later, the first extremely small plants began to appear on the surface of the water.

A．millions

B．million

C．million of

D．millions of

A 【解析】考查固定用法。Millions of上百万的，许许多多的;因为横线后面有of，排除D项。

考点分析：

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