We know that about seventy percent _____ the earth _____ covered by water.A．/; isB．of; areC．of; isD．about; are-初中英语-n多题

◎ 题干

We know that about seventy percent _____ the earth _____ covered by water.

A．/; is	B．of; are
C．of; is	D．about; are

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◎ 解析

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◎ 知识点

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