canbedoing与cando区别
在ietls真题6考官范文里第168和172页,有以下2个句子
Iwouldsaythatchangecanbestimulatingandenergisingforindividuals.
Sittinginfrontofascreenfortoolongcanbedamagingtoboththeeyesandthephysicalpostureofayoungchild.
为什么要用canbedoing而不是cando