Peter is swimming_______(cross)the river.急,不知是用crossing,还是cross

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Peter is swimming_______(cross)the river.急,不知是用crossing,还是cross
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Peter is swimming_______(cross)the river.急,不知是用crossing,还是cross
Peter is swimming_______(cross)the river.急,
不知是用crossing,还是cross

Peter is swimming_______(cross)the river.急,不知是用crossing,还是cross
cross,因为前面已经是动词了,后面不用ing形式