The correct answer is OPTION 3 - MUST
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"Have to" expresses necessity or obligation, but it is usually used when the obligation comes from an external source (e.g., rules, regulations).
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"May" expresses possibility or permission, which does not fit in this context.
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"Must" expresses strong necessity or obligation, making it the best fit for this sentence.
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"Will" is used for future intentions but does not indicate obligation.
Revised sentence:
They must prepare their lessons well before their examination. |
