I worked as hard as I could for the final exam.A. to prepareB. prepareC. preparingD. prep

问题补充：

I worked as hard as I could for the final exam.

A. to prepare

B. prepare

C. preparing

D. prepared

答案：

(答案→)A. to prepare

B. prepare

C. preparing

D. prepared

解析：本题考查非谓语动词的用法。as...asonecan后接to do做目的状语，表示“尽力做某事”。