A dictionary is an useful book.这句话错在哪?

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Adictionaryisanusefulbook.这句话错在哪?Adictionaryisanusefulbook.这句话错在哪?Adictionaryisanusefulbook.这句话错在哪?应

A dictionary is an useful book.这句话错在哪?
A dictionary is an useful book.这句话错在哪?

A dictionary is an useful book.这句话错在哪?
应该是a useful book u在这里音素是/ju：/所以是辅音开头,用a