中国大学MOOC: Dog trainers usually train their dogs first to ( ).
举一反三
- 中国大学MOOC: To train dogs to fetch，trainers often start with a ( ).
- 中国大学MOOC: What is the most important thing for dog trainers to do?
- 中国大学MOOC: Dogs usually have an _______ sense of smell.
- 中国大学MOOC: A good first impression is usually formed within the first few seconds.
- 中国大学MOOC: 28. While writing business messages, ______is usually the first step.