__ most of the earth's surface is covered by water,fresh water is very rare and precious.
__ 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
A.as B.once C.If D.While
英語人氣：483 ℃時(shí)間：2020-01-29 15:44:17
優(yōu)質(zhì)解答
D.雖然地球表面大部分都是覆蓋著水,但是淡水資源還是非常少和珍貴的.While 是雖然的意思.
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