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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

解析試題分析：句意：我們都知道恐龍在地球上生存在6千萬年前。表示確切數(shù)字，million不用復數(shù)；表示概數(shù)，million必須用復數(shù)，并且和介詞of連用，所以選A。
考點：考查數(shù)詞。

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