We all know that dinosaurs lived on the Earth more than ______ years ago.
A．sixty millionB．millions ofC．sixty million ofD．million of
A

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(fù)數(shù)；表示概數(shù)，million必須用復(fù)數(shù)，并且和介詞of連用，所以選A。
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