People t( )on holiday can send e-postcards 填travel行吗

People t( )on holiday can send e-postcards 填travel行吗
People t( )on holiday can send e-postcards 填travel行吗

People t( )on holiday can send e-postcards 填travel行吗
填travelling可以.因为后面已经有send这个动词了,句子中不能再出现第二个谓语动词,所以不能用travel

就是填travel。没错！