- obey
- object
- oblige
- observation
- observe
- observer
- or so
- obtain
- obvious
- occasion
- one after another
- occasional
- occupy
- occur
- ocean
- October
- odd
- of
- off
- offend
- offer
- office
- officer
- official
- on board
- often
- oil
- old
- omit
- on
- once
- oneself
- onion
- only
- onto
- open
- opening
- opera
- operate
- operation
- opinion
- opportunity
- oppose
- opposite
- oral
- orange
- order
- orderly
- on the ground of
- of itself
- ordinary
- organ
- organization
- organize
- origin
- original
- other
- otherwise
- ought
- ounce
- on condition that
- our
- ours
- ourselves
- out
- out of
- outcome
- outdoor
- outer
- outlet
- outlook
- output
- outside
- outstanding
- outward
- oven
- over
- overcoat
- overcome
- overlook
- oversea
- owe
- own
- owner
- ox
- on purpose
- on business
- on the spot
- on the contrary
- off duty
- on duty
- once in a while
- on the whole
- on the basis of
成人英语成人高考专升本单词单词大全〔O 〕课程包含94个英语单词词汇。