Multiple choice

He ___ be a fool to do such a thing.

  1. can

  2. must

  3. will
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The phrase 'must be' expresses a logical conclusion or strong deduction about someone's character or behavior in a hypothetical situation. 'Can be' suggests possibility but is too weak. 'Will be' is a future prediction that doesn't capture the logical necessity. 'Must be' conveys that doing such a foolish thing necessarily makes someone a fool.

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