單選題Ispenthalfanhour________myhomewor

D解析解析：spend v.花 (時(shí)間、金錢(qián))
(1) sb. spend+時(shí)間／錢(qián)+on+sth.，如：
①I(mǎi) spent two yuan on this book.這本書(shū)我花了兩元錢(qián)。
②I spent two hours on my homework yesterday.昨天，我花了兩個(gè)鐘頭做作業(yè)。(2) sb. spend+時(shí)間／金錢(qián)+ (in) +doing sth.，例如：He spent two days (in) looking for the cat.他花了兩天時(shí)間找貓。
此題中為spend... doing sth.，即finish doing sth.。