问题补充：
--- How is your English study?
--- Not bad. But I learning English grammar.
A. am interested in
B. am good at
C. have a little trouble
D. have no trouble
答案：
A. am interested in
B. am good at
(答案→)C. have a little trouble
D. have no trouble
解析：句意：你的英语学习怎么样？还不错。但是在学习语法方面我有点困难.have trouble doing sth.做某事有困难。be interested in 对…感兴趣；be good at 擅长；have no trouble 没有困难。根据句意，选C。
