I spent two days reading the storybook.A. finishB. finishedC. finishingD. to finish

问题补充：

I spent two days reading the storybook.

A. finish

B. finished

C. finishing

D. to finish

答案：

A. finish

B. finished

(答案→)C. finishing

D. to finish

解析：句意：我花费了两天的时间读完了这本故事书。spend+时间、金钱+doing sth.花费时间或金钱做某事。根据这一句型，本题中应用动词的-ing形式，故选C。