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In 1984 medical researchers at Harvard and Stanford universities concluded that sedentary life-styles lead to heart and lung diseases that shorten lives, strongly recommending middle-aged people to undertake some form of regular exercise.

A. strongly recommending middle-aged people to
B. strongly recommending that middle-aged people should
C. and strongly recommended for middle-aged people to
D. and their strong recommendation was for middle-aged people to
E. and they strongly recommended that middle-aged people