It's obviously more difficult to swim __ the stream than __ the stream.介词填空

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It's obviously more difficult to swim __ the stream than __ the stream.介词填空

It's obviously more difficult to swim __ the stream than __ the stream.介词填空
It's obviously more difficult to swim __ the stream than __ the stream.介词填空

It's obviously more difficult to swim __ the stream than __ the stream.介词填空
第一个空:up,第二个空:down