Choose the most suitable option to replace the highlighted part of the sentence:
It is high time you must follow a proper routine.

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Accepted Answer

1. The phrase **"It is high time"** is followed by a past tense to show that something should already be done.
2. So we need the past form **"followed"** after it.
3. Option (a) **"followed a proper routine"** fits this rule.
4. The others use wrong tenses or extra words.
FINAL_ANSWER: a

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