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
across,in
穿过激流比在激流中游泳明显更难.