◎ 题干
—I'm sorry, this kind of PSP is too expensive. I can't afford _____ it.  
—It's OK.

A. buy
B. bought
C. to buy
D. buying
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—I'm sorry, this kind of PSP is too expensive. I can't afford _____ it.—It's OK.[ ]A. buy B. bought C. to buy D. buying …”主要考查了你对  【不定式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。