—You didn’t seem to enjoy your meal very much.
—It’s not that. I am just .
A. on a diet
B. on diets
C. go on a diet
D. making a diet
网友回答
(答案→)A. on a diet
B. on diets
C. go on a diet
D. making a diet
解析：“你似乎不爱吃肉”“不是，我在节食” be on a diet “节食”系表结构表示状态；go on a diet “节食”强调动作。 根据语境应是强调状态所以选A