一般情况下是不可以省略的,尤其是在完整的陈述句中.例如：I can sing a song in French.这里就不能说：I can a song in French.但是,有一些特殊情况是可以省略的：反义疑问句如：I can swim, can you?这里就省略了第...O(∩_∩)O谢谢 那Charles did what he could to rescue the servant ,although he himself was in danger。这句话中的could后是省略了do吗？