用适当的介词或副词填空.It's easy for me to swim ____ the river.

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用适当的介词或副词填空.It's easy for me to swim ____ the river.
用适当的介词或副词填空.It's easy for me to swim ____ the river.

用适当的介词或副词填空.It's easy for me to swim ____ the river.
in 在河里游泳,在里面,所以用in