国家开放大学 / 综合英语（1）
– Monica has lost much weight, hasn’t she?
– Yes. She is _ _ _ _ a diet.
a.in
b.with
c.on
d.off
– Yes. She is _ _ _ _ a diet.
a.in
b.with
c.on
d.off
参考答案：
佳题速递：