---He spent as much time as he could his spoken EnglishWish him good luck !A. impro

问题补充：

---He spent as much time as he could his spoken English.

--- Wish him good luck !

A. improve

B. improving

C. to improve

D. improved

答案：

A. improve

(答案→)B. improving

C. to improve

D. improved

解析：不定式做目的状语。句意“他尽可能多的花费时间提高英语口语。”“祝他好运”