1.the fire _in the furnace under the house A is believed to started Bthat they believed to start答原因是甚么

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1.the fire _in the furnace under the house A is believed to started Bthat they believed to start答
原因是甚么

A是对的.
这是一个句子,需要有谓语,被动态作谓语.选B的话就缺谓语,

the fire is believed to be started in the furnace under the house. A.