介词填空Mostoftheearth'ssurfaceiscoveredwater这里用by还是with为什么?

Question

介词填空Most of the earth's surface is covered ____ water这里用 by 还是with 为什么?

Answer 1

cover with是遮盖的意思
she covered her face with her hands.
或者是撒上（一层液体 尘土之类）
the wind blew in from the desert and covered everything with sand
`````更多的就不讲了····
在表示覆盖的时候应该用cover by
Much of the country is covered by forest.
所以这里也是