They have some problems _____ tothe hill (ride/rides/riding/to ride)

分类: 作业答案 • 2023-01-18 10:59:49

问题描述：

They have some problems _____ tothe hill (ride/rides/riding/to ride)
请说明理由
请说明理由.

答

riding
这是固定结构,have some problems（in）doing sth你记住就行了!