为什么要说try it on而不是try on it,

为什么要说try it on而不是try on it, try it on和try on it.为什么有的时候那个“it”要放介词前面,有时又放后面? try on try on try it I want this pair of pants.Can I ( ) A.try it on B.try them on 选哪一个?为什么? this pair of glasses looks very nice.May i try ________?A:try them on B:try it on C:try on themD:try on it I like this sweater ,can I____?A,try it onB.try on itC.try them onD.try on them Try It On My Own 歌词 Why not try it on?什么意思 英语：是try it on 还是try on it?The shit is very smart .Can i___?A.try it on B.try on it C.try on them D.try them on 选择题：1 this coat is nice, can i____? A: try it on B: try on it C: try on them This pair of shoes is very nice. May I ______.A.try it on B.try them on C.try on it D.try on them This pair of shoes is nice .can I ____? A try on it B try it on C try on them D try them on I want to buy this pair of jeans.Can I___?A.try on them B .try them on C.try it on D.try on it理由 The trousers are size medium .Please ___ A.try it on B.try them on C.try on it D.try on them原因 This blue dress is beautiful.Can I_____?A try it on B try on it C try in it D try it in These pants look very nice.Can I______?A.try it on B.try them on C.try on them