most of the earth’s surface is covered by water, fresh water is very rare and precious.A.

发布时间：2020-08-17 02:42:35

     most of the earth’s surface is covered by water, fresh water is very rare and precious.
A. As
B. Although
C. If
D. Once

网友回答

A. As
(答案→)B. Although
C. If
D. Once
解析：句意：尽管地球的表面覆盖着水，但是淡水还是稀少的和宝贵的。as因为；         although尽管； if 如果； once一旦。根据句意故选B。
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