The fantastic mud-rock flow in Zhouqu of Gansu at about 22 o’clock on August 7th was

问题补充：

The fantastic mud-rock flow in Zhouqu of Gansu at about 22 o’clock on August 7th, was considered deaths of more than 1,000 natives .

A. to cause

B. causing

C. to be causing

D. to have caused

答案：

A. to cause

B. causing

C. to be causing

(答案→)D. to have caused

解析：考查非谓语动词。be considered to have done认为过去做过某事，根据句意选D。