中国大学MOOC: He beat about the ______for a half hour without coming to the point.
举一反三
- It is about ______ walk from here to the office. A: half an hour's B: half a hour's C: half an hours'
- A half hour of jogging is equivalent to about an hour of rock climbing.
- You need about half an hour to walk .
- It usually _______ mum about half an hour to cook supper.
- 走了半个小时，他决定还是找人问下路。 A: After half an hour he decided to ask somebody for the directions. B: After half a hour he decided to ask for somebody the directions. C: After half an hour he decided to ask somebody for directions.