单选题
An action that is
lavishly
rewarded as soon as it is performed is well on its way to becoming a habit.
【正确答案】
D
【答案解析】[解析] 这句话的意思是：一旦完成就会得到______的奖励的行为正成为一种习惯。lavishly：丰富地，浪费地。在给出的选项中，promptly：立刻地，敏捷地；abruptly：突然地；evidently：明显地，显然地；generously：宽大地，慷慨地。根据句意和划线单词的意思可知，正确答案是D。