his homework my son went downstairs to play basketball.A. Having finishedB. finishedC. to

问题补充：

his homework, my son went downstairs to play basketball.

A. Having finished

B. finished

C. to finish

D. finishing

答案：

(答案→)A. Having finished

B. finished

C. to finish

D. finishing

解析： 考查非谓语动词作状语。my son与finish之间是主动关系，且分词的动作发生在谓语动词之前，故用现在分词的完成式，所以选A，句意：我的儿子完成作业之后他就去楼下打篮球。