_______ is even important is ______ as the earth cooled down, water began to appear on its surface.
A．That, thatB．What, thatC．What, whatD．It, that
B

試題分析：考查名詞性從句：句意：甚至更重要的是，隨著地球冷卻下來，水開始出現(xiàn)在它的表面。第一空是what引導(dǎo)的主語從句，what在主語從句中做主語，第二空是that，連接表語從句，因為表語從句是完整的，不缺成分，選B。
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