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As far as I know,more than two-thirds of the earth's surface

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As far as I know,more than two-thirds of the earth's surface______water.
A.is coverd by B.are coverd with C.are covering D.is covering

有哪位大神知道这该选什么?为什么啊?急!
As far as I know,more than two-thirds of the earth's surface
选：A,要用 by,被.覆盖.
译文：据我所知,超过三分之二的地球表面被水覆盖.
分数在句子中作主语时,谓语动词的单复数形式取决于分数后面的名词是单数还是复数.surface为不可数名词,谓语动词用is.
请看复数的例句：
Two-thirds of the students of our class are league members.(students是复数,谓语动词用are) 我们班上三分之二的学生是共青团员.
再问： 为什么分数在这里面做主语呢？
再答： Two-thirds of the students 主语：三分之二的学生，其中三分之二是分数。 整数可数名词的话，1用单数；2以上的自然数用复数，分数的情况特殊。
As far as I know,more than two-thirds of the earth's surface 选择as we all know, two thirds of the earth's surface is water 一道英语改写句子(More than two-thirds) of the Earth's surface is wat About two thirds of the Earth's surface is covered by the se No activity affects more of the earth's surface than farming as far as I know 英语 —What' s ____ population of China?—As far as I know China 英语翻译Yet the surface of the Earth is not as solid or as perma As a result of the serious earthquake,two-thirds of the buil As a result of the serious flood,two-thirds of the buildings 9. As a result of the serious flood, two-thirds of the build 4. As a result of the serious flood,two-thirds of the buildi