The doctor often made his patients wait for long.
Explanation:
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Waited: This form is the past tense of "wait," but it doesn't fit the context because the sentence is discussing a habitual action (present tense).
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Waiting: This form is the present participle of "wait," but it's not the best fit here because the sentence requires the simple form of the verb.
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To wait: This phrase isn't suitable in this context. The sentence structure should use the simple form of the verb "wait."
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Wait: This is the correct choice. The sentence requires the simple form of the verb "wait" to express the doctor's habit of making patients wait for a long time.
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