If you have some difficulties your grammar you had better ask your teacher .A. in; on so

问题补充：

If you have some difficulties your grammar, you had better ask your teacher .

A. in; on some advice

B. for; for some advices

C. on; some advice

D. with; for some advice

答案：

A. in; on some advice

B. for; for some advices

C. on; some advice

(答案→)D. with; for some advice

解析：考查短语：在某方面有困难have difficulties with；向某人寻求建议ask sb for some advice，句意：如果你在语法方面有一些困难的话，你最好向你的老师寻求建议。所以选D。