—Mike, I don’t know nice cartoon books.
—Why not go to the bookstore near my house? The books there are both cheap and nice.
A. where to buy B. what to buy C. when to buy
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解析：know后接特殊疑问代词+to do （vi+介词）；特殊疑问代词+to +do（vt）；特殊疑问副词+to do（vi）；特殊疑问副词+do（vt）+sth，故选答案为A