The fat man( )keep exercising.

问题描述:

The fat man( )keep exercising.

doesn't
keep exercising 保持锻炼、运动 keep是原形,主语是the fat man(三单),只有在否定句里加助动词才用动词原形,因此加doesn't,逻辑上胖人不太保持运动,所以否定形式