We started the attack when the enemy (cross) ______ the river.were crossing根据句意，

游客2024-07-19 15

问题 We started the attack when the enemy (cross) ______ the river.

选项

答案 were crossing

解析根据句意，从句表示过去某段时间正在进行的动作，所以时态要用过去进行时。

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