问题补充:
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
答案:
A. As
B. Once
C. If
(答案→)D. Although
解析:本道题考查让步状语从句。一定要看懂:虽然地球表面覆盖着水,但是纯净水仍然很稀有和珍贵。选择D.
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