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!
问题描述：
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!
答