To keep fit, you should take more . Don’t be always busy doing your .A. exercise; exercise

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A. exercise; exercise
B. exercises; exercises
C. exercises; exercise
(答案→)D. exercise; exercises
解析：本题考查名词。句中take exercise为“锻炼”之意；do one’s exercises做练习。句意：为了保持健康，你应当做更多的锻炼。不要总是忙于做你的练习。