是on doing so 还是in doing so

是on doing so 还是in doing so got an invitation to do sth 还是 on doing sth/in doing sth/of doing sth 一个词组(wait on line)题目是这样的there were so many people in the park that i couldn't find a good place 这里是doing还是to do 呢 photos选择的是to take 和taking spend in doing还是 on doing call on sb后面是doing还是to do move on to do还是doing? Go on 后加do, 还是doing ? 像这样做 是by doing so 还是 in doing so这两个短语是不是有一个是错误的? waste的用法waste sth. in doing sth.是doing还是to do还是waste sth. to do sth. be successful in +doing 还是 to do? carry carry on 和go on的意思一样吗?是carry on doing 还是carry on to do? work on doing sth还是work on to do sth? children usually like play in the park on sunday改错 并说明为什么?到底是to do不定式还是doing呢 两者的区别 be good at do well in 这两个后面是加do 还是 doing there are many things ______（do）in Singapore.是填doing还是to do? 在英语中是spend sometime to do 还是 spend sometime （in）doing?还是都行? rely on 可以组成那些短语是to do ,还是doing. do one's best 用法do one's best 后面是加 in doing sth?还是to do sth