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英语
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__ most of the earth's surface is covered by water,fresh water is very rare and precious.
A.as B.once C.If D.While
人气：255 ℃ 时间：2020-01-29 15:44:17
解答
D.虽然地球表面大部分都是覆盖着水,但是淡水资源还是非常少和珍贵的.While 是虽然的意思.
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