问题
选择题
—Your watch is so beautiful. It must be expensive.
—Not at all. I only ￥20 on it.
A. cost B. spent C. paid
答案
答案：B
根据几个动词的用法，cost的主语为物，spent 与paid的主语为sb，其结构为sb+spent money +on sth。故选B
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