What is even more important is______ the earth cooled down, water began to appea
题型：不详难度：来源：
What is even more important is______ the earth cooled down, water began to appear on its surface.| A．that | B．that as | C．which | D．which as |
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答案
| B |
解析
试题分析：考查表语从句。本题中的that引导的是表语从句，表语从句中有一个时间状语从句。句意：更重要的是随着地球的冷却下来，水也开始出现在地球的表面上了。故B正确。
点评：本题的难度在于从句中含有从句，that在从句中不充当任何成分，只起连接作用。本题的表语从句中含有as…的时间状语从句。 |
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