Spot the error in the given sentence:
The visitors / complained at / the poor accommodation / they were given.
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When using "complain," the preposition "about" is commonly used to express dissatisfaction with something. "At" is typically used with actions or places, not with complaints.
The error in the sentence lies in the preposition used. The correct preposition after "complained" is "about," not "at." The correct sentence should read: "The visitors complained about the poor accommodation they were given."