interested her most was the longitude line. It’s an imaginary line the eastern and weste

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A. That; dividing
B. What; divided
C. That; divided
(答案→)D. What; dividing
解析：考查名词性从句及现在分词作定语。第一空考查主语从句，缺少主语故用what,第二空用dividing作an imaginary line后置定语。句意：使她最感兴趣的是这条经线，它是一条把世界分成东西半球的富有想象的线。故选D。