We should always bear in mind that our own determination to success is more important tha

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A. it
B. this
C. that
D. this
解析：考察it形式宾语。本题的it是形式宾语，真正的宾语是后面的宾语从句that our own determination to success is more important than anything else.结合句意可知A正确。句意：我们应该记住我们成功的决心比任何别的事情都重要。