问题补充：
----This sweater is too expensive. I can’t afford it.
----How about this one? It’s than that one.
A. cheapest
B. more cheaper
C. much cheaper
D. too cheaper
答案：
A. cheapest
B. more cheaper
(答案→)C. much cheaper
D. too cheaper
解析：句子中有than 说明用比较级，而more 不能修饰比较级，much能修饰比较级，故选C
