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

问题描述:

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

填on。
冬天我们经常在河上溜冰,因为河上的冰非常厚。

答案:in
请采纳,谢谢支持!

on
注:on the river 在河面上