When _____ the accident _____?
A: A was; happen
B: B did; happen
C: C is; happen
D: D was; happened
A: A was; happen
B: B did; happen
C: C is; happen
D: D was; happened
举一反三
- ― _____ An accident has happened. A. Where was the accident? B. What happened? C. When was the accident? D. Why did it happen?
- When exactly did the accident （happen同义词）______ ?
- Can you tell _______?: when did it happen|when it happened|when it was happened|when was it happened
- 66. There’s a police car here, what do you suppose ____? A: is happened B: has happened C: world happen D: did happen
- 2. When did this happen?