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

游客2023-10-03  38

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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