2. 职称英语
  3. We started the attack when the enemy (cross) ______ the river.were crossing根据句意，

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

游客2024-07-19  35
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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