______most of the earth’s surface is covered by water, fresh water is very rare

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

选项 A、As
B、Once
C、If
D、Although

答案 D

解析本题考查的是连词的用法。根据句意应选择表示让步的连词，因此选择Although。本句的意思是：“尽管大部分地球表面被水覆盖，但是淡水还是很少、很珍贵。”

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