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

分类: 作业答案 • 2021-12-19 16:30:11

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

have some problems in doing sth 应是riding in 有时可省略

答

to ride

答

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