"a 20 dollar bill”中dollar为什么不用复数?是不是因为这个20 dollar是指货币的面值?那是不是所有表示货币面值的都不用复数?

i'd like to chang a ten-dollar bill.能否换成i think that chang a ten-dollar bill?为什么 a 20 dollar bill”中dollar为什么不用复数?是不是因为这个20 dollar是指货币的面值?那是不是所有表示货币面值的都不用复数? 英语中连字符号之前可以加冠词么比如这道题：The woman took____one dollar bill from her purse .A.a B.an C.the D./ million dollar bill Even though I have only________,let me pay the bill.A.a few dollars B.few dollars C.a little dollar D.little dollar为什么选a不选b? a 20 dollar fine翻译 并说明为什么,请各个大侠帮帮忙.What a beautiful flat Especially there are many ______.A.furniture B.furnitures C.pieces of furniture D.pieces of furnituresLast term ,my boy won a ______prize.A.50-dollar bill B.50-dollars bill C.50-dollar you'll probably be able to change a dollar bill 翻译 This is___ one-hundred-dollar bill (有理由） / the an a break the 10-dollar bill的意思 the price of the trousers 27 A.is,dollar B.is,dollar C.are,dollar D.are,dollars linda won a ______prize in the writing competition 1.20-dollar 2.20 dollar 3.20-dollars4.20 dollars He bought three ____________ ties for just $ 12.A：five-dollar B：fives-dollar C：five-dollars D：fives-dollars He gave the taxi driver a—.A five dollar bill B five--dollars bill C five--dollar billD five dolls bill请求懂的人分析一下选项,问什么选c不选b啊?It took us long time to get there.It was ___journey.A three--hour B a three hour C a th Could you change the one-dollar bill for coins? a dollar for Haiti On the table there are ________.A.five ten-dollar bills B.five ten-dollars bill C.five ten dollars bills 5、On the table there are ________.A.five ten-dollar bills B.five ten-dollars bill C.five ten dollars bills