My grandfather keeps healthy by for half an hour every morning.
A. working out
B. acting out
C. taking out
D. looking out
网友回答
(答案→)A. working out
B. acting out
C. taking out
D. looking out
解析：动词短语辨析。work out锻炼；算出；，理解；制定出；act out将…表演出来；（用行动）表示出来;take out取出；割掉；拔去；取得；擦掉；look out当心；句意：我的祖父每天早晨锻炼半小时，以保持健康。