Not until I handed in the paper did I find easier to solve the problem that way.A. that B

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。