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

试题分析:句意:我们都知道恐龙在地球上生存在6千万年前。表示确切数字,million不用复数;表示概数,million必须用复数,并且和介词of连用,所以选A。
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