---Look! Why are there so many people?
---There are some policemen. I think there must be a traffic accident _____in the street.
| A．to happen | B．happen |
| C．is happened | D． Happening |
---Look! Why are there so many people?
---There are some policemen. I think there must be a traffic accident _____in the street.
| A．to happen | B．happen |
| C．is happened | D． Happening |
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