Scientists think there has been life on Earth for millions o

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Scientists think there has been life on Earth for millions of years.拜托各位了 3Q
这句话为什么用has而不用have呢?

科学家认为地球上的生命（生物）已经存在了数百万年."life"在此句中的含义是"生命、生物",作"生命、生物"来讲,是【总称】,作为整体的概念.故此句中的谓语应为单数形式,即用"has"而不用"have".希望我的回答能令你满意.

Scientists think there has been life on Earth for millions o 英语翻译Scientists think that there has been life on Earth for m Scientists think that there has been life on Earth for milli Scientists think there has been life on Earth for ______ yea 请各位帮忙翻译一下Scientists think that there has been life on Earth Scientists think that there has been _____（life） on the eart 英语翻译Volcanoes have been erupting on the earth for millions o so weather life will continue on the earth for millions of y So whether life will continue on the earth for millions of y Do you think there was life on e___ millions of years ago? They believe there has been life on Mars,has'nt there?这个反意问句 scientists have been resreaching what effect smoking has on