问题补充：
、Not until I handed in the paper did I find easier to solve the problem that way.
A. that
B. it
C. one
D. myself
答案：
A. that
(答案→)B. it
C. one
D. myself
解析：考察it作为形式宾语。本句中的It是一个修饰宾语，真正的宾语是后面的不定式to solve the problem that way.句意：知道我上交了我的论文，我才发现用那种方法解决问题更为容易。在英语中，只有it可以作为形式主语或者形式宾语。故B正确。
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