I spent half an hour ________ my homework.
A.finish doing
B.to finish doing
C.finish to do
D.finishing doing
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D解析解析：spend v.花 (时间、金钱)
(1) sb. spend+时间／钱+on+sth.，如：
①I spent two yuan on this book.这本书我花了两元钱。
②I spent two hours on my homework yesterday.昨天，我花了两个钟头做作业。(2) sb. spend+时间／金钱+ (in) +doing sth.，例如：He spent two days (in) looking for the cat.他花了两天时间找猫。
此题中为spend... doing sth.，即finish doing sth.。