问题补充：
---You have been on tour for a week in our city during May Day. What do you think about it?
---Oh, what different Nanjing! It isn’t I saw last.
A. /; the one
B. a; the one
C. a; one
D. /; one
答案：
A. /; the one
(答案→)B. a; the one
C. a; one
D. /; one
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