( ) 15.I spent half an hour ___________ my homework .finish doing sth 完成做某事
问题描述：
( ) 15.I spent half an hour ___________ my homework .finish doing sth 完成做某事
( ) 15.I spent half an hour ___________ my homework .finish doing sth 完成做某事
A.finish doing B.to finish doing C.finishing to do D.finishing doing
答
D.finishing doing
spend sometime doing sth
finish doing sth