sb.is at/in somewhere doing sth.这个句型是什么?

sb.is at/in somewhere doing sth.这个句型是什么? sb is in possession of be surprised at sb还是sth,be surprised in呢是in加sb还是at加sb drop in on sb./ drop in at a place翻译 look at sb in th mirror,in the local mine sth is in the possession of sb sth is in the possession of sb What is in sb letter?是什么意思 on sb'home还是in还是at?为什么? be better than sb 是 in 还是 at sth? is sb.good at Math?(改为同义句) sb.look at sb.in a smile有这种搭配吗 sb in doing sth 是there is nothing wrong with sb in doing sth sb is 物理选择题~!求大家帮忙解决~!2.The coordinate of a particle in meters is given by x(t)=16t-3.0t^3, where the time t is in seconds. The particle is momentarily at rest at t=a)0.75sb)1.3sc)5.3sd)7.3sb)9.3s是问停留的时间?大家帮忙 be good with sb的意思,be good at do well in的联系,taik to sb,taik with sb,speak to sb,talk say tell speak qubiehelianxi 英语造句：用get to arrive at、arrive in、reach、keep sb./sth.+adj.、sb. spend some (in) doing sth. 英语造句：用get to arrive at、arrive in、reach、keep sb./sth.+adj.、sb.spend some (in) doing sth.