非谓语动词英语题求教
the firefighters were searching the burning train hor survivors,with masks（ ） their mouths A.covering B.covered 为啥不选B帽子不是被带嘛?
那这句如何解释：：
2.with the help of kind neighbors,tom returned to the campus again with his heart （ ） with gratitude A、filled B.filling 为什么不选B 不是主动吗