问题补充：
Though I am improving in my study,I still have a long way to go some of my classmates.
A. to compare with
B. to compare to
C. comparing with
D. compared with
答案：
A. to compare with
B. to compare to
C. comparing with
(答案→)D. compared with
解析：过去分词短语在句中作状语。句意为：虽然我的学习进步了，但是和一些同学比起来我仍然有很长的路要走。
