is more important is as the earth cooled down, water began to appear
题型：不详难度：来源：
is more important is as the earth cooled down, water began to appear on its surface.| A．What /that | B．That/what | C．What / what | D．That / that |
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答案
| A |
解析
| 本题考查名词性从句。第一个空是一个缺少空语的主语从句，第二空是一个表语从句，表语从句又是一个as引导的时间状语从句。因此答案是A。 |
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