问题补充：
All the other boys have geography books and they will be ahead of me if I don’t get .
A. it
B. the one
C. one
D. that
答案：
A. it
B. the one
(答案→)C. one
D. that
解析：it/one/that的用法和区别
I. it/one /that三者均可用作代词, 指代前面提到的名词。一般说来, it指代同名同物; one与that则指代同名异物。
II. one与that虽可用来指代同名异物, 但one为泛指, 相当于a/an＋名词; that为特指, 相当于the ＋名词。所以one所指代的名词的修饰语一般为 a/an /some /any; that所指代的名词的修饰语往往是the /this /that。
根据题意，这里是泛指任何一本书地理书，故用one，选D。
