__ 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,

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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.although为什么?请详细说明,分析每个选项,

__ 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,
__ 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,

__ 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,
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选项，as 表由于的意思，是作连词连接句子的。即由于most of the earth's surface is covered by water，所以fresh water is very rare and precious. 很合理，选A。
~B选项，虽说once也可以作连词连接句子，但是表一旦的意思，根本不符合地球的实际情况（意思是说，地球还未被海洋覆盖大部分表面），不选。

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~A选项，as 表由于的意思，是作连词连接句子的。即由于most of the earth's surface is covered by water，所以fresh water is very rare and precious. 很合理，选A。
~B选项，虽说once也可以作连词连接句子，但是表一旦的意思，根本不符合地球的实际情况（意思是说，地球还未被海洋覆盖大部分表面），不选。
~C选项，if表如果，也不符合地球的实际情况，跟上面犯了一样的逻辑错误。
~D选项，although表虽然，你试试，这样的话存在语病。

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