his studies he started travelling in China.A. As soon as finishB. As soon as finishingC.

问题补充：

his studies, he started travelling in China.

A. As soon as finish

B. As soon as finishing

C. Upon finishing

D. Upon finish

答案：

A. As soon as finish

B. As soon as finishing

(答案→)C. Upon finishing

D. Upon finish

解析：句意，学习一结束，他就开始游历中国。分词动作“finish”和主语“he”之间是主动关系，故用现在分词作时间状语。