The big fire in Shanghai, believed to ______ due to the burning of construction materials, caused 58 deaths and destroyed all the belongings of the people there.
| A．have occurred | B．occur |
| C．have been occurring | D．be occurring |
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The big fire in Shanghai, believed to ______ due to the burning of construction materials, caused 58 deaths and destroyed all the belongings of the people there.
| A．have occurred | B．occur |
| C．have been occurring | D．be occurring |
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