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Heisbyytheriver.这里为什么不能填写skating,swimming,boating只能填写fishing?

题目详情
He is _____byy the river .这里为什么不能填写skating,swimming,boating只能填写fishing?
▼优质解答
答案和解析
skating 后面接on the river
swimming后面接in the river
boating 后面接in the river
这句话的意思是:他在河边钓鱼.