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非谓语动词英语题求教the firefighters were searching the burning train

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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
非谓语动词英语题求教the firefighters were searching the burning train
1.前面选A表示是他们现在都戴着这种状态,B的话只是说明戴口罩的动作,根据前后句语境选A
2.gratitude 感激之情是被填满在心里的,被动