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

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

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

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

b.is covered

C