This pair of shoes___and I'll have___ A.is worn out ；it mended.B.is worn out；them mended.我搞不清楚究竟要选it还是them.请附上理由!为什么前面指代a pair of而后面指代shoes?为什么没有统一

1.There__ a pair of shoes under the bed.The shoes__ mine.A.is; are B.is,is C.are; is D.are; are This pair of shoes isn tgood,but that pair is___better this pair of shoes is made of leather_________ ___________ this pair of made of whose pair of jeans is this? This pair of socks is yours This pair of glasses _____ (look) nice. This pair of shoes f____me very well This pair of socks___mine( is,am ,were) This is a pair of shorts中文翻译 This pair of shoes look very nice. this pair of trainers is c____to wear this pair of the shorts是什么意思 This pair of trousers are yours 改错 This pair of white socks = This pair of shoes are big. This pair of pants___ his.Mine___ here. 改错 This pair of trousers are mine This pair of pants .为什么不用these