sat in/sat at的区别?

sat in/sat at的区别? 雅思,托福,SAT 的区别? SIT 和SAT 的区别 SAT和ACT的区别? ACT与SAT的区别 ap 与sat的区别? st&sat与sat&date这两个牌子的区别? SAT SAT Sat sat sat SAT SAT SAT SAT Several young girls were ( ) looking bored.A.sat back B.sitting in C.sat down D.sitting around要原因顺便说一下sat back ,sitting in ,sat down ,sitting around.的区别 SSAT和SAT的区别是什么呀?