It is important for us our English. A. improving B. improved C. to improveD. improves

问题补充：

It is important for us our English.

A. improving

B. improved

C. to improve

D. improves

答案：

A. improving

B. improved

(答案→)C. to improve

D. improves

解析：句意:对于我们来说提高我们的英语水平是重要的。本题考查的是句型It is 形容词for sb. to do sth. 意为：对于某人来说做某事是……的。故应选C。