spend time doing 其中省略了那个介词?

spend time doing 其中省略了那个介词? spend time后面+on doing还是spend time doing sb.spend time(in)doing sth. spend time in doing sth和spend time on doing sth的区别 spend doing sth和spend on sthspend doing sth等于spend on it takes sb some time to do sth 等于 spend doing sth 、 spend on why? sb spend some time in doing sthsb.spend st./sm.(in) doing sth.造句 英语语法：是spend some time doing sth.还是spend some time to do sth. ? spend time on sth 和spend time in doing sth 用法和区别 spend time in doing sth 和spend time to do sth有什么区别? spend time to do something 和spend time doing something的区别 英译汉.①sb spend $/time on sth ②sb spend $/time in doing一定要正确, spend time on doing something is correct, is that spend time to do something okay? He needs ___ time ____ his homework A to spend; doing B spend ; doing C spend ;to do Much time ___(spend) doing his homework last night spend a lot of time sitting and doing nothing very More time should be (spend) in doing exercise cost sb 5 yuan/ spend time doing sth 是什么意思 We can spend more time doing some outside reading翻译