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
( ) 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
问题解答：
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