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
__ 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.although
为什么?
请详细说明,分析每个选项,
A.as B.once C.if D.although
为什么?
请详细说明,分析每个选项,
其他人气：470 ℃时间：2019-10-25 06:27:21
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