88. The doctor recommended that you ------- swim after eatin

D.shouldn't
在宾语从句中用于 recommend,suggest,propose,move,insist,desire,demand,request,order,command 等动词后的宾语从句中,表命令和建议.从句中谓语形式是"(should) + 动词原形".
suggest sb （should）do sth；should可以省略,若要加情态动词,只能是should而不能用别的.