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all member of the Baja basketball team are required to commit to a high-protein and carbohydrate diet

_________ training for the natinal games.

 

a. when

b. that

c. by

d. at

 

정답은 a인데요

해석으로만 하자면 c도 가능하지않나요???ㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠ