问题
选择题
| They can buy the pens _____ a very good _____. |
A. at, price B. in, price C. at, cost D. at, selling |
答案
答案：A
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| They can buy the pens _____ a very good _____. |
A. at, price B. in, price C. at, cost D. at, selling |
答案：A