2. When did this happen?
举一反三
- Q5: When did the earthquake happen?
- When exactly did the accident （happen同义词）______ ?
- When _____ the accident _____? A: A was; happen B: B did; happen C: C is; happen D: D was; happened
- Can you tell _______?: when did it happen|when it happened|when it was happened|when was it happened
- 中国大学MOOC: When did the Glorious Revolution happen in Great Britain?