A completely new situation will when a new tool comes into use.A. ariseB. riseC. raiseD. a

问题补充：

A completely new situation will when a new tool comes into use.

A. arise

B. rise

C. raise

D. arouse

答案：

(答案→)A. arise

B. rise

C. raise

D. arouse

解析：A. arise出现 B. rise上升 C. raise抚养 D. arouse出现，过去时态；句意：当这个新的工作使用后，一个完全的新情况就会出现。故选A