Is that a old book改错

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Is that a old book改错

Is that a old book改错
Is that a old book改错

Is that a old book改错
a改为an ,因为old是以o(元音)开头

a改成an

a改为an ,因为old是以o(元音)开头

Is that an old book?

把a改成an

Is that an old book ?