다음 중 잘못된 문장이 무언가요?
(a) Last Sunday, Jackson held a picnic at City Park.
(b) He had organized it as part of his campaign to save the park.
(c) There were lots of games, contents and refreshments, and, best of all, the picnic was free.
(d) The festivities began with Jackson given a short, five-minute speech in defense of the park.
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