__ most of the earth's surface is covered by water,fresh wat

__ 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,

雪菜虾米汤 1年前已收到2个回答举报

longzhu22 花朵

共回答了19个问题采纳率：89.5% 举报

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

1年前

feifei726 幼苗

共回答了49个问题举报

~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。

1年前

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