The doctors and nurses did all they could to save the little boy's life.这句话对吗
问题描述：
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?
答
这里的all they could do的do就是前面的did,这里的 all they could指所有他们可以(做的事),补充了前面did的内容