Question

---Why shouldn’t I buy a new coat.

---I haven’t bought______for five years.

1. A.
   it
2. B.
   that
3. C.
   one
4. D.
   which

Answer 1

C
one 指 a coat。比较：it =" the" +名词，one = a+名词，换句话说，it 是特指的，而one 则是泛指的。