问题补充：
I like your pet dog very much. But I can’t find in the pet shop. Where did you buy ?
A. it, it
B. it, one
C. one, one
D. one, it
答案：
A. it, it
B. it, one
C. one, one
(答案→)D. one, it
解析：it特指上文提到过的具体的某物，one指上文提到过的同类事物中的一个，是泛指的
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