问题补充：
My friend English than me, so she often helps me with my projects.
A. does better on
B. is good for
C. is best at
D. does better in
答案：
A. does better on
B. is good for
C. is best at
(答案→)D. does better in
解析：be good at和do well in都可以表示擅长做某事，比较级是be better at和do better in，故本题选D。
