. . . . . . . . exercise he is writing is very easy. A. a B. an C. the D. none of the above

The correct answer is: a

The article “a” is used before singular nouns that refer to a general or unspecified thing. In this case, the exercise is not specific, so we use “a”.

The article “an” is used before singular nouns that begin with a vowel sound. In this case, the exercise does not begin with a vowel sound, so we do not use

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