—Can i help you ,sir?____Yes ,I bought this radio here yesterday ,but it___work Acan't B doesn't为何不选A

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—Can i help you ,sir?____Yes ,I bought this radio here yesterday ,but it___work Acan't B doesn't为何不选A
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—Can i help you ,sir?____Yes ,I bought this radio here yesterday ,but it___work Acan't B doesn't为何不选A
—Can i help you ,sir?____Yes ,I bought this radio here yesterday ,but it___work Acan't B doesn't
为何不选A

—Can i help you ,sir?____Yes ,I bought this radio here yesterday ,but it___work Acan't B doesn't为何不选A
can是情态动词,表示具有某种能力或意愿.radio不能用,不是有能力而不愿工作.用doesn't表示客观说明.

因为如果选A,表达的意思是它本来就无法使用,而题目的意思是收音机本来是可以用的,但昨天无法用了。can 有表示能力,许可,请求的意思。