Form refers to the__of text.
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Structure.

Explanation:

Form refers to the structure of text.

In English language, a text mainly comprises of various words, phrases elements, and sentences to form a literary work that is concise, meaningful and understandable by the readers.

Basically, the arrangement of the text written by a writer can be done in many different ways such as use of paragraphs, indentation, etc. Therefore, these elements and arrangements defines the form (structure) of a text.