英文改错题.求详解When it (1)grows dark ,she turned a suitcase into a
英文改错题.求详解 When it (1)grows dark ,she turned a suitcase into a bed and put the children inside it,(2)covered them with all the clothes she could find. 为什麽第一个不改成had grown而改成grew? 第二个为什麽改成covering?