That book is not expensive. You can buy it ___ twelve _.That book is not expensive. You can buy it ___ twelve ____.A. at; dollar B. for; dollars C. at; pounds D. for; pound请解释一下原因 谢谢

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That book is not expensive. You can buy it ___ twelve _.That book is not expensive. You can buy it ___ twelve ____.A. at; dollar B. for; dollars C. at; pounds D. for; pound请解释一下原因 谢谢
That book is not expensive. You can buy it ___ twelve _.
That book is not expensive. You can buy it ___ twelve ____.
A. at; dollar B. for; dollars C. at; pounds D. for; pound
请解释一下原因 谢谢

That book is not expensive. You can buy it ___ twelve _.That book is not expensive. You can buy it ___ twelve ____.A. at; dollar B. for; dollars C. at; pounds D. for; pound请解释一下原因 谢谢
C
首先,美元英镑要用复数,排除A D
第二,多少金额的搭配,可以用for或者at
两者区别是,at 一般恩price,要是跟了具体的价格,at 是指既定金额,for 是指可以讨价还价的金额
这里根据上下文,是指既定价格,因此用介词at