I must go to see . . . . . . . . old teacher. A. a B. an C. the D. no article

The correct answer is: no article.

The word “old” is an adjective that describes the noun “teacher”. Adjectives do not usually take articles. In this case, the teacher is not being identified specifically, so we do not need to use an article.

If we were to use an article, it would change the meaning of the sentence. For example, if we said “I must go to see a old teacher”, it would mean that we are going to see any old teacher, not a specific teacher. If we said “I must go to see the old teacher”, it would mean that we are going to see a specific old teacher, who

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