问题补充：
—Mum, have you seen my U-Disk?
— you bought last Sunday? Im-afraid I haven seen ．
A. The one- one
B. That: one
C. One; it
D. The one; it
答案：
A. The one- one
B. That: one
C. One; it
(答案→)D. The one; it
解析：考查it和The one的用法，The one特指某一个东西，one泛指某一个东西；it指上文已提及的事物，句子意思“你上个星期买的那个吗？我恐怕没有看见它”，所以选D
