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【题目】__________ is even more important is _________ the earth cooled down, water began to appear on its surface.

A. What; that as B. It; which

C. It; which as D. What; which

【答案】A

【解析】

试题分析:考查名词性从句。句意是:更重要的是由于地球变冷,水开始出现在它的表面。第一空是主语从句,缺少引导词,缺少主语,所以填what;第二空是表语从句,从句不缺成分,只缺引导词,所以填that;在表语从句中包含一个as引导的原因状语从句。故选A。

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