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that is an interesting book .
to distinguish between a , an look at these rule
A +singular noun beginning with aconsonant;
a car a book ......
An + singular noun beginning with a vowel;
an apple , an egg.........
an
An interesting book.
That is an interesting book
The vowel " an " will be used hereThis is an interesting book.
the answer is
That is an interesting book
First i am not ebglish teacher but i always balance my phrase according to the logic sense , meaning if i a said a then when i spell it , it will be heavy weighted but when i say an then its less weighted by sequence i think the answer is AN.
the answer is "an"
AN because interesting has a Consonant sound
