the boy is so naughty that he sometimes turn a deaf ear to what his parents have advised.why?

the boy is so naughty that he sometimes turn a deaf ear to what his parents have advised.why?

题目
the boy is so naughty that he sometimes turn a deaf ear to what his parents have advised.why?
为什么从句用动词turn?不应该是turns?the boy is so naughty that he sometimes turn a deaf ear to what his parents have advised.
答案
应该是turns.turn是错误的
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