There is a discount on last year's cards句中为什么用is后接cards

There is a discount on last year's cards句中为什么用is后接cards There is a discount ()last year is cards.a:in,b:on,c:of,d:at there's a d____ on last year's cards. I want last year's cards(改为同义句）There are (some cards)over th Do you have a discount on the cards ( 同义句) 将这个句子改为同义句THERE IS A DISCOUNT ON LAST'SPOSTCARDSTHEY SELL LA is there a discount ( ) last month discount可数吗?为什么是there is a discount discount不可数呀,可课本上却说there is a discount on.,用了a Destiny is a deck of CARDS,licensing is god,play CARDS is my what is on the cards for you now?是什么意思 There is more rain this year than last year.改同义句 It's （ ）thi