【題目】_____ is even important _____ as the earth cooled down, water began to appear on its surface.

A. That, which B. What, that

C. What, what D. It, that

【答案】D

【解析】句意：甚至更加重要的是隨著地球變冷了，水開始出現(xiàn)在它的表面。這句話使用it做形式主語，that引導的是真正的主語從句。所以選D。

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