问题补充：
-- Excuse me, I want to buy some stamps. Where can I find a post office?
-- I know not far from here. You can find without difficulty.
A. that; it
B. it; one
C. one; it
D. it; that
答案：
A. that; it
B. it; one
(答案→)C. one; it
D. it; that
解析：one是一个的意思,泛指任何一个,it为人称代词,用来指前文提到的事物,that是指示代词,那个.根据题意,前文为泛指任何一个,后文指前面的提到的邮票,故选C.
