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     is even more important is              the earth cooled down, water began to appear on its surface.
A.When; that; whenB.What; whether; as C.What; that; asD.lt; whether; as
C

这题考查从句的用法,第一空填what做主语从句,在主语从句中what做主语,第二空填that引导表语从句,在表语从句中,as是引导时间状语从句,句意是:甚至更重要的是:随着地球的冷却,水开始出现在表面。选C。
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