—Youdon'tseemtoenjoyyourmealverymuch.—Notreally,Iamjust...

问题详情：

—You don't seem to enjoy your meal very much.

—Not really, I am just ________．

A．on a diet  B．on diets

C．on purpose  D．on business

【回答】

A　考查固定搭配。on a diet 节食。

知识点：介词

题型：选择题