i bought this book ___ one yuan a copy.填ati bought this book ___ _英语解答

i bought this book ___ one yuan a copy.填at
i bought this book ___ fifty cents.填for

人气：154 ℃　时间：2019-11-07 02:28:33

解答

at 表示以XX的单价购买
for 表示一共出了多少钱