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

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They have some problems _____ tothe hill (ride/rides/riding/to ride)请说明理由请说明理由.
x) HTH,KU(MU((OI-VT̜̔T}Q "3K@|뷿XٌڞOوճI*ҧ=`L&g_`gC?A@\tݬ'?ע{:2LjS(.xwua㋅=Ov)$A}b@݄M lO2 ,RPxk Ёe|6}4>p|

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

They have some problems _____ tothe hill (ride/rides/riding/to ride)请说明理由请说明理由.
riding
这是固定结构,have some problems(in)doing sth你记住就行了!

to ride

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