the boy is swimming ___the river 为什么填across而不是in

the boy is swimming ___the river 为什么填across而不是in The boy is swimming( across the river). The boy is swimming across the river.变为被动语态 he is swimming across the river改错 The boy swimming in the river is my friend Dave.(对swimming i jim with his friends ()in the pool now ,这里为什么填is swimming而不是 The young man ____ in swimming across the river yesterday. He is swimming across the river.用across the river提问英语句子 at last he s() in swimming across the river she swimming across the river she is swimming over the river Is the boy ______ in the river?He's__________in the swimming Look!The boy is swimming ____ with his parrents in the river