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问题: 作业帮忙 阶段作业2 问题5 请解析

5、I __________ less than fifty yuan for my shoes.
A、spent
B、cost
C、paid
D、rewarded

解答:

c. paid

用法:paid 15 yuan for...
spent 15 yuan on...
xxxx cost me 15 yuan.

reward是奖赏.