When I have problems I often ask my teacher __

试题详情及答案解析: When I have problems I often ask my teacher ___ .
A. to helping
B. help
C. for hel; 答案：C; 试题分析：句意：当我有困难时，我经常向我的老师寻求帮助。ask sb for向某人要……。结合句意，故选C
考点：考查动词的用法。