问题补充：
This sweater fits me, but I can’t afford to buy . I have to choose which is cheap enough for me.
A. it; that
B. that; it
C. it; one
D. that; the one
答案：
A. it; that
B. that; it
(答案→)C. it; one
D. that; the one
解析：
试题分析:考查不定代词。that指代不可数名词，it特指上文提到的名词；one指代泛指的同类单数名词，句中第一空指代上文提到的this sweater，用it；第二个空是泛指一件便宜的，所以用one，答案选C。句意：这件毛衣很合适，但是我买不起。我得选一件对我来说够便宜的。
