But _________ first thought of putting tea leaves into small bags?

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Multiple Choice

But _________ first thought of putting tea leaves into small bags?

Explanation:
Thinking of the right person is the focus here. The sentence asks who was the first to have that idea, so the word that fits is the pronoun used for a person as the subject of the action “thought.” Who identifies the person responsible for the idea. What would ask about a thing or idea itself, Which would require a defined set to choose from, and Where asks about a place. So the natural, correct choice is the one that points to the person who did the thinking.

Thinking of the right person is the focus here. The sentence asks who was the first to have that idea, so the word that fits is the pronoun used for a person as the subject of the action “thought.” Who identifies the person responsible for the idea. What would ask about a thing or idea itself, Which would require a defined set to choose from, and Where asks about a place. So the natural, correct choice is the one that points to the person who did the thinking.

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