The case shocked the public a hot debate over human nature on the Intemet.A. causesB. caus

问题补充：

The case shocked the public,a hot debate over human nature on the Intemet.

A. causes

B. caused

C. causing

D. to cause

答案：

A. causes

B. caused

(答案→)C. causing

D. to cause

解析： 考查非谓语。事件震惊了公众，在网上引起了关于人性的激烈讨论。事件与cause形成主谓关系，所以选C。