Difficulty: Easy
Correct Answer: protest against
Explanation:
Given sentenceMost donors would seriously protest any effort to extrapolate from such limited data.
Concept/ApproachWhen the object is an action/proposal, the collocation is protest against (e.g., protest against a decision). 'Protest to' is used with a person, and 'protest at' is less common/BrE-specific for places or events.
Correctionprotest against any effort …
Final Answerprotest against
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