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 occurredB.occurC.have been occurringD.be occurringB为什么不行 以及求所有选项的

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 occurredB.occurC.have been occurringD.be occurringB为什么不行 以及求所有选项的
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
B为什么不行 以及求所有选项的解释

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 occurredB.occurC.have been occurringD.be occurringB为什么不行 以及求所有选项的
occur 发生；不及物动词
A to have occurred 为动词不定式的完成式,表示一个先于believe而发生的动作.大为先发生,人们后认为.