Little Jim found the way to Grandma's by___the policeman for help
问题描述：
Little Jim found the way to Grandma's by___the policeman for help
答
asking
ask for help 寻求帮助
by 后面接动名词 也就是 ing形式
希望可以帮助到你！
祝你学习进步！
答
asking
介词后要接动名词.
ask sb.for help 请求某人的帮助.