is more important is      as the earth cooled down, water began to appear on its surface.
A．What /thatB．That/whatC．What / whatD．That / that
A
本題考查名詞性從句。第一個空是一個缺少空語的主語從句，第二空是一個表語從句，表語從句又是一個as引導(dǎo)的時(shí)間狀語從句。因此答案是A。
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