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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
B

試題分析：考查表語從句。本題中的that引導的是表語從句，表語從句中有一個時間狀語從句。句意：更重要的是隨著地球的冷卻下來，水也開始出現(xiàn)在地球的表面上了。故B正確。
點評：本題的難度在于從句中含有從句，that在從句中不充當任何成分，只起連接作用。本題的表語從句中含有as…的時間狀語從句。
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