Question

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

Answer

 A

【解析】

试题分析：考查固定句型：Sth is believed to do/to have done…据说将要做/已经做了，句意：上海最大的火灾据说是由于焚烧建筑材料造成的，导致58人死亡，毁了那里人们所有的财物。意思应该使用主动态而且是完成时态的不定式。occur是已经发生的动作，用不定式的完成时态；该词的用法只可能用主动语态。因而答案是have occurred！选A。

考点：考查固定句型：