The doctors in the children's hospital did all they could___[save]the sick baby

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• 1.儿童医院的医生做了他们所能做的一切来救治生病的婴儿The doctors in the Children's Hospital did ___ ___ ___ to save the sick baby.2.接近大自然3.落后4.这使我很烦恼This made ___ ___ ___ myself.5.“Cool" is ___________________________ 另一种说法 “wonderful"
• The doctors in the children's hospital did all they could___[save]the sick baby
• The doctors in the children's hospital did all they could___[save]the sick baby
• The doctors and nurses did all they could to save the little boy's life.这句话对吗我觉得all they could应该改成all they could do才对啊?
• The doctors did everything they could to save the dying old woman but failed.在文章中看到这个句子,我的疑惑是:这个句子中情态动词could后面跟了带to的不定式.有这样的用法吗?我只知道,情态动词后只跟动词原形.谁能解答下我的疑惑,to save...应该是不定式短语