Is Mary the third one _____ the left? No,the first ______ the right . A.from to B.from on C.on to

Is Mary the third one _____ the left? No,the first ______ the right . A.from to B.from on C.on to
这题还有个答案D.infrom
看答案里是选B 可是为啥捏?难道是因为第一个空前多了一个one 所以用from?没学过啊~~~~~~大虾们出手啊~~~速度快的补加分啊~~
顺便再问一个：Here's a ______ bag.
A.ten-kilosB.ten-kiloC.ten kilosD.ten kilo选哪个。。。。。。