We have sweaters at very good price 为什么要加at啊

We have sweaters at a very good price-only 25 We have sweaters at a very good price ------only 25 We,have,sweaters,at,a,very,good,priceonly￥25! We have sweaters in all colors at $50 e_. We have sweaters in all colors at $e_.We have sweaters in all colors at $50 e_. We have sweaters at very good price 为什么要加at啊 We have sweaters at a very good price-only25.句中的at怎么理解 We have sweaters ___yellow and red .A.in.B.for.C.of.D.at we HAVE sweaters IN red,green and black at 50 DOLLARS EVERY 哪个有错 We have sweaters _all colors _10 yuan each A in;on B of;on C in;at D at;at We have sweaters()all colors()29yuan each.A.in,forB.at,forC.in.inD.at,at We have sweaters in all ___ (颜色). 填空：We have sweaters in all c______. 合并：“We have sweaters.”“They are cheap. 合并：“We have sweaters.”“They are cheap.” How is your father This is she skirt .It's very nice We have sweaters at red for 18 yuan We have sweaters ______ all colors ______ 50 yuan eachA.in,at B.at,in C.in,in D.at,at选哪一个?我没有打错噢! 我们有各色的毛衣,每件50元.we have sweaters all我们有各色的毛衣,每件50元.we have sweaters all at 50yuan.