need to do 还是need doing ...

need to do 还是need doing ... need to do ,need doing need help to do 还是 need help doing no need doing 还是no need to do need doing need to do 区别 need do/need to do/need doing的意思 need do;need to do;need doing的区别? The trees need+ do/doing还是to do? need time 后面加to do 还是 doing,为什么? need的用法?need to do还是need do? need to do和need doing的区别 practice for ,need to do,need doing 造句