This sentence completion question tests your understanding of idiomatic expressions in English. The sentence is: "He is one of those scholars whom the committee has always looked _ _ _ _ _ as a potential successor to the chair."
Let us analyse each of the options:
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Up to: The phrase "look up to" is an idiomatic expression that means to admire or respect someone. This fits well in the sentence, suggesting that the committee respects him as a potential successor to the chair.
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Forward to: The phrase "look forward to" means to eagerly anticipate something. This doesn't fit the context since it implies anticipation rather than admiration or respect.
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Into: The phrase "look into" means to investigate or examine something. This doesn't fit the context as the sentence requires an expression of admiration or respect.
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Onto: "Look onto" is not a standard idiomatic expression in this context and thus is not applicable.
In conclusion, the correct answer is "up to" as it correctly completes the idiomatic expression and aligns with the context of the sentence, indicating respect or admiration.