-how much are the socks?-they are_the prize_$50.A for,of B on,in C in,at D at,of

问题描述:

-how much are the socks?-they are_the prize_$50.A for,of B on,in C in,at D at,of

D. at,of

答案:【at,of 】at the price of...的价格
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