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问题: 15. Layer upon layer of deep snow means that, (tho

15. Layer upon layer of deep snow means that, (though) melted, the snow water would be pure, not salty (so that) seaice would be
A .unless....like b unless....as C .when...like D .when...as

解答:

(WHEN)当雪融化时,雪水是纯净的,(AS)不像海里的冰那样咸!
为什么用AS,因为后面是一个句子。