Foundation
English
Verb
Tenses
Question
You ____1___ have your hair cut very short in the first month,
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Solution
The correct answer is option A because 'must' expresses compulsion or strong obligation which is true here because following the rule of short hair is a necessity.
Option B is incorrect because 'can' is used to express ability or to give to permission,which is not correct in this case as it is not a choice.
Option C is incorrect because 'would' is used in the future tense.
Option D is incorrect because 'could' is the past tense of can. It is used to talk about ability that existed in the past.