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

這題考查從句的用法，第一空填what做主語從句，在主語從句中what做主語，第二空填that引導(dǎo)表語從句，在表語從句中，as是引導(dǎo)時(shí)間狀語從句，句意是：甚至更重要的是：隨著地球的冷卻，水開始出現(xiàn)在表面。選C。
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