Peter is swimming _______(cross)the river.

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Peterisswimming_______(cross)theriver.Peterisswimming_______(cross)theriver.Peterisswimming_______(c

Peter is swimming _______(cross)the river.
Peter is swimming _______(cross)the river.

Peter is swimming _______(cross)the river.
应该用across,因为前面是动词,后面是名词,名词前应该用cross 的介词形式