He ________ be very intelligent once but now he has become careless. 1. Could 2. Will 3. Shall 4. Used to
Understand the Problem
The question is asking to fill in the blank with the correct option to complete the sentence about intelligence in the past. The focus is on understanding the correct use of modal verbs or phrases that indicate a past state.
Answer
Used to
The correct answer is 'Used to'.
Answer for screen readers
The correct answer is 'Used to'.
More Information
The phrase 'used to' is commonly employed to describe actions or states that were habitual or true in the past but no longer are.
Tips
A common mistake is choosing 'could', which suggests possibility rather than past habit.
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