When idioms are used in actual context, they do experience ______ changes such as different forms of verbs, agreement of personal pronouns and number and so on.
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The following are all variations of idioms, except ______.
A. replacement
B. addition
C. shortening
D. repetition
What is the advantage of classifying idioms according to their grammatical functions
Juxtaposition means ______ are used in forming idioms.