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:考查名詞性從句。根據(jù)結(jié)構(gòu)可知is 后面是表語從句，表語從句中又有狀語從句，所以需要兩個連接詞，一個引導(dǎo)表語從句，一個引導(dǎo)狀語從句。which引導(dǎo)從句需做成分，而表語從句中不缺少成分，所以B選項正確。句意：甚至更重要的是當(dāng)?shù)厍蚶鋮s的時候，水開始在地球表面上出現(xiàn)了。
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