In winter we often skate __________ the river,because the ice there is very thick

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In winter we often skate __________ the river,because the ice there is very thick
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In winter we often skate __________ the river,because the ice there is very thick
In winter we often skate __________ the river,because the ice there is very thick

In winter we often skate __________ the river,because the ice there is very thick
on
注:on the river 在河面上

答案:in
请采纳,谢谢支持!

填on。
冬天我们经常在河上溜冰,因为河上的冰非常厚。