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
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C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。