He's an executive

[English Learner]

Test No. incompl/elem-42 "Basic Business English", question 6

He ......... executive.

(a) is
(b) is an
(c) is a
(d) an

Test No. incompl/elem-42 "Basic Business English", answer 6

He is an executive.

Correct answer: (b) is an
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why "an" ?

[Torsten]

He is an executive. You need an here because the noun executive starts with the vowel e.

More examples:

an idea
an idiom
an example
an opportunity
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