11. A: How did the accident happen ? B: You know , it ______ difficult to see the road clearly because it _____ .
举一反三
- I know it will be difficult to pick him out in such a crowd , but if you ___ happen to see him , give him this note.
- In order to impress the interviewer, you need to know clearly about the job descriptions and see how your strengths can match with them.
- “How many elephants did you see? “______”
- What did you see and how did you feel on your first day of college?
- When _____ the accident _____? A: A was; happen B: B did; happen C: C is; happen D: D was; happened