问题补充：
---Mum, could you buy me a dress like this?
---Certainly, we can buy one than this, but this.
A. a better; better than
B. a worse; as good as
C. a cheaper; as good as
D. a more important; good as
答案：
A. a better; better than
B. a worse; as good as
(答案→)C. a cheaper; as good as
D. a more important; good as
解析：better更好的；worse更坏的；cheaper更便宜的；more important更重要的。better than 比……好；as good as和……一样好。句意：妈妈，你能给我买一件这样的连衣裙吗？——当然了，我们要买一件比这件便宜但是和这件一样的。结合语境可知选C。
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