The last few years many natural disasters around the world from drought to earthquake.A.

问题补充：

The last few years many natural disasters around the world, from drought to earthquake.

A. see

B. are seeing

C. have seen

D. saw

答案：

A. see

B. are seeing

(答案→)C. have seen

D. saw

解析：句意：最近几年见证了世界各地的许多自然灾害，从干旱到地震。动作时从过去一直持续到现在，see有见证之意，故选C。