— 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
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解析：考查形容词用法。本题的关键在于But表示转折。句意：—妈妈，我可以穿这样的一件衣服吗？—当然。我们可以买一件更便宜的，但是和这件一样好。As…as…与…一样；根据句意说明C正确。