Select the most appropriate option to fill in the blank.

We have _______ long weekend ahead.

a

The most appropriate option to fill in the blank is a.

The word "a" is used to refer to an unspecified or indefinite noun. In this case, the noun is "long weekend". We do not know what the specific long weekend is, so we use the indefinite article "a".

The other options are incorrect.

• An is used to refer to a noun that begins with a vowel sound. The word "long" does not begin with a vowel sound, so we do not use the indefinite article "an".
• One is used to refer to a specific noun that has already been mentioned. The word "long weekend" has not been mentioned before, so we do not use the definite article "one".
• The is used to refer to a specific noun that is already known. The word "long weekend" is not known yet, so we do not use the definite article "the".