问题补充：
This is the book I bought yesterday , I spent 8 yuan .
A. on which
B. for which
C. in which
D. at which
答案：
(答案→)A. on which
B. for which
C. in which
D. at which
解析：本题考查定语从句中介词的选用。spend some money on sth为一固定搭配。故选A。
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