So suddenly __________ that people had no time to escape.
| A．did the big fire happen |
| B．the big fire happened |
| C．was the big fire happened |
| D．the big fire was happened |
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So suddenly __________ that people had no time to escape.
| A．did the big fire happen |
| B．the big fire happened |
| C．was the big fire happened |
| D．the big fire was happened |
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