finishing his homework he went to play basketball.A. InB. UponC. AtD. With

问题补充：

finishing his homework, he went to play basketball.

A. In

B. Upon

C. At

D. With

答案：

A. In

(答案→)B. Upon

C. At

D. With

解析：考查介词：Upon doing一做…,句意：一做完作业，他就去打篮球了。选B。