about seventy percent od our earth ___by watera.is covering b.is covered c.are covered d are covering

来源：学生作业学帮网 编辑：学帮网 时间：2024/06/06 02:09:15

about seventy percent od our earth ___by water
a.is covering b.is covered c.are covered d are covering

b
用单数~

b.is covered

C