They work hard, but their efforts are not very __________.
举一反三
- They work hard, but their efforts are not very _________ (product).
- They work hard, but their efforts are not very __________. A: concentrate B: productive C: enrolled D: schedule
- to work very hard
- 中国大学MOOC: They work hard,but their efforts are not very____. (product)
- ______ the boss is hard on us at work, after work he is very kind to us.