Tim has invented butter in a stick
举一反三
- 57. James watt ____ the steam engine. A: was inventing B: invented C: had invented D: has invented
- Tim has been at this restaurant for many times.
- Has Tim’s family experienced such difficulty before?
- Tim used to ______ in Tianjin, but now he has moved to another city.
- Tim has stayed up late till midnight for two weeks.