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__mostoftheearth'ssurfaceiscoveredbywater,freshwaterisveryrareandprecious.A.asB.onceC.ifD.although为什么?请详细说明,分析每个选项,
题目内容：
__ most of the earth's surface is covered by water,fresh water is very rare and precious.
A.as B.once C.if D.although
为什么?
请详细说明,分析每个选项,优质解答
应该是选D吧``
虽然地球上表面大部分都被水覆盖,但淡水还是非常稀有和珍贵
A.as B.once C.if D.although
为什么?
请详细说明,分析每个选项,
优质解答
虽然地球上表面大部分都被水覆盖,但淡水还是非常稀有和珍贵
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