题目内容：

miss he,we promise-____our desks and chairs clean after class.good boy a.not keep b.not to keep
c.to keep d,keep

优质解答

c.to keep
promise to do sth 保证作某事
何小姐,我们保证下课后保持桌椅清洁.

追问：

lucy's diet is______than kitty's a.less healthy b.less healthier c.more healthier d.healthy

追答：

a.less healthy