MOst of our earth___covered by water..a.are b .is c.was d.were选哪个为什么?

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MOstofourearth___coveredbywater..a.areb.isc.wasd.were选哪个为什么?MOstofourearth___coveredbywater..a.areb.

MOst of our earth___covered by water..a.are b .is c.was d.were选哪个为什么?
MOst of our earth___covered by water..
a.are b .is c.was d.were
选哪个为什么?

MOst of our earth___covered by water..a.are b .is c.was d.were选哪个为什么?
is
主语是 earth